Electroplating rectifier

Electroplating rectifier


Electroplating rectifier greenization:

Electroplating rectifier system greenization have profound meaning:
The first is significant energy-saving, which means save power generation capacity, while power generation is an important cause of environmental pollution, so power saving can reduce environmental pollution; and secondly these power can not (or less) generates pollution to power grid, International Electrotechnical Commission (IEC) has developed a series of standards such as IEC555, IEC917, IECl000. In fact, many power electronic energy-saving equipment, often turn into sources of pollution on the grid: inject to grid of serious harmonic current, make the total power factor drops, so many glitches coupling grid voltage spikes and peaks, even chipping and distortion. In end of 20th century, a variety of active filter and active compensator was born, with a variety of power factor correction method. Laid the foundation for mass production of a variety of green switching power supply in 21 century.

Modern power electronics technology is the basis for development of electroplating rectifier:

Modern power electronics is the basis for development of electroplating rectifier technology. With the continuous emergence of new power electronic devices and adapted to more higher switching frequency circuit topology, modern power supply technology driven by real needs will be rapid developped. In traditional application technique, due to the performance limits of power leaving, switching power supply device performance is affected. Greatly put to good use of characteristics of various power devices, minimize device performance impact on switching mode rectifier, new power circuit topology and new control technology enables power switching at zero voltage or zero current state, which can greatly increase the operating frequency, improve work efficiency of switching mode power supply, then design excellent performance switch mode power supply.

More electroplating rectifier waiting to be developed:

In short, power electronics and switching electroplating rectifier technology continues to move forward due to application requirements, the emergence of new technologies will make many applications replacement products, but also to open up more and new applications. High frequency rectifier switching power supply, modular, digital, greenization etc., will mark these technologies as mature, to realize high efficiency and high-quality electricity application combined. In recent years, with the development of the communications industry, switch power technology as the core of communications switching power supply, only the domestic market demand of more than 20 billion yuan, has attracted a large number of scientific and technical personnel to develop research. Switching power supply instead of linear power and phase control power supply is the trend and will soon be developed. There are many other in switching power supply technology as the core of a dedicated power supply, industrial power are waiting for people to develop.

Electroplating rectifier

Electroplating rectifier

IGBT rectifier

IGBT rectifier


Briefly of IGBT rectifier:

Through comprehensive analysis of the equivalent circuit to simplify explain cumbersome IGBT working principle and the role, and noted IGBT characteristics. It can be said, IGBT is a switching device either on or off, it combine both advantages of of MOSFET’s high input impedance and GTR’s low conduction voltage drop.

IGBT Rectifier constitution:

IGBT (insulated gate bipolar transistor), constituted of BJT (bipolar transistor) and MOS (insulated gate field effect transistor) composite full-controlled type voltage-driven power semiconductor devices, with high input impedance MOSFET and GTR’s low on-state voltage drop down. GTR saturation pressure drop, carrier high current density, but the drive current is large; MOSFET drive power is very small, fast switching speed, but large conducting voltage drop, the carrier density is small.
IGBT combines advantages of these two devices, the driving power is small and the saturation while voltage drop low. Very suitable for the DC voltage of 600V and above, variable flow systems such as AC motor, inverter, switching power supply, lighting circuits, traction drive and other fields.
Insulated gate bipolar transistor (IGBT) is the youngest one of high voltage switch family. A 15V high-impedance voltage source facilitate control current flow through the device which can achieve a lower control power to control the high current.

IGBT rectifier principle and action:

Simply to say, IGBT is a switch, either on or off, how to control its on or off, by the gate-source voltage, when the gate-source plus +12V (greater than 6V, generally take 12V to 15V) the IGBT conducting, gate source voltage is not applied or is applied negative pressure, IGBT turn-off, a negative pressure purpose is reliably shut off. No amplified voltage IGBT function, turn on can be seen as the wire, other as open circuit when disconnected.

IGBT rectifier conduct/insulation electricity:

IGBT has three terminals, namely, G, D, S, G and S ends apply voltage, the internal electrons transfer (characteristic of the semiconductor material, which is the reason why use semiconductor material as power electronic switch), originally correspondence of positive and negative ions, semiconductor material in neutral, but applied voltage, electrons under the influence of voltage, accumulation to one side, forming a layer of conductive channel, because the electron is electrically conductive, becomes a conductor . If remove applied both ends voltage of GS, this layer of conductive channel disappear, do not conduct electricity, and become insulators. This is pass of IGBT rectifier.

IGBT rectifier

12v dc power supply


12v dc power supply Category:

12v dc power supply switching power supply circuit structure of variety configuration:

(1) By driving points, there are self-excited and separately-excited type.
(2) According to the working mode DC/DC converter points:
① Single-end excitation and reverse, push-pull, half-bridge, full-bridge, etc;
② Reduce voltage, increase voltage and reduce/increase voltage type.
(3) Based on the circuit points, there are resonant and non-resonant.

(4) 12v dc power supply control points:

① Pulse width modulation (PWM) type;
② Pulse frequency modulation (PFM) formula;
③ 12v dc power supply PWM and PFM mixed type.
(5) According to power supply whether isolated and feedback control signal coupling points, there are isolated, non-isolated and transformer-coupled, optical coupling type and so on.
The above combination may constitute a variety of ways of 12v dc power supply switching mode power supply. So designers need a variety of ways according to the characteristics combined to produce meet the needs of high-quality switching mode power supply.

12v dc power supply control method:

Based on TRC control theory, there are three ways:
A, Pulse width modulation (Pulse Width Modulation, abbreviated as PWM) Switching period constant, by changing pulse width to change the duty cycle.
B, Pulse frequency modulation (abbreviated as PFM) Conduction pulse width constantly, by varying the switching working frequency to change the duty cycle.
C, Combined modulation Conduction pulse width and switching working frequency are not fixed, each can be changed, it is more than two ways of mixing. High-frequency switching power supply does not need to greatly improve the switching speed can be theoretically reduced to zero switching losses, also the noise is small.

12v dc power supply

12v dc power supply

Pulse power supply gold plating

Pulse power supply gold plating

Pulse power supply gold plating superiority:

The superiority of pulse power supply plating can be better reflected especially on gold plating. Pulse power supply gold plating could obtain dense crystal electroplating layer coating, that not only significantly increased its finish degree, corrosion resistance, weldability, wear resistance, high temperature capability and have a greater degree of discoloration, but also greatly saved gold.

Pulse power supply gold plating

Pulse power supply gold plating

Someone think no need pulse power supply gold plating:

But there is a view: that barrel gold electro plating using pulse power supply of little significance to improve the density, which their reason is that the barrel plating machine tumbling action make the coarse crystals can not grow, therefore can get dense electroplating layer coating, bright, so no need use a pulse power supply. This view seems not unreasonable, but that is biased. Because barrel plating machine tumbling just a mechanical polishing action, its limited capacity and can not replace the role of fine-grained action generated large pulse current by electro chemical polarization. Therefore, if there is high quality requirements of gold plating, still need to use pulse rectifier gold plating, which this is the best control method outside the plating tank.

Vivid explain to tell you why need pulse power supply gold plating:

For example, now integrated lead frame, linear tube shell, connectors and other parts the pulse power supply barrel plating has been very common.
Also, there is gradually formed a consensus that gold plating bottom plating – nickel layer electroplating should also adopts pulse rectifier plating. The reason is pulse-plated nickel layer of stress, density, uniformity is far superior to the DC rectifier nickel plating, which undoubtedly will lay a solid foundation for gold electro plating, thus greatly improving the functional indicators of gold plating.
For example, one electronic products factory choosing pulse rectifier plating for products gold plating, and the thickness of the gold electro plating layer meet the requirements, which plating workpieces appearance is also good, but still can not meet the 380 ℃ ~ 450 ℃ temperature assessment test. Then they hire experts to help them to solve the problem. One of the measures is to use a pulse power supply nickel barrel plating instead of DC power supply, of course, there are other measures, such as strict operation, improved Pulse power supply gold plating liquid formulations and so on.

The parameters pulse power supply gold plating adopt can refer to the following:

Single pulse: 10% to 20% duty cycle (turn on: 0.1ms ~ 0.2ms, turn off: 0.8ms ~ 0.9ms), pulse frequency 900Hz ~ 1000Hz, the average current density equal to or slightly larger than the DC power source plating;
Reverse pulse: positive pulse duty cycle of 20% (turn on: 0.2ms, turn off: 0.8ms), working time 100ms, the average current density equal to or slightly larger than the DC rectifier plating;
Reverse pulse duty cycle of 10% (on 0.1 ms, off 0.9ms), working time 10ms, an average current density of the reverse peak current density of the positive peak current density of 1 to 2 times, obtained by calculating backwards.

But many people believe that when acidic gold plating, because the gold anode insolubility, reverse peeling double pulse does not work, so the use of the double pulse is superfluous. In fact, the double pulse reverse reeling gold plating only improve the uniformity small, but it can not say that is superfluous, or can not say there is no significance. There is a small experiment may indicate the presence or absence of other dual pulse gilded significance. In the same acidic gold plating solution, the same current density, respectively, DC power source, single pulse, double pulse at the same time each plating a test piece. Comparison of three test pieces, can see clearly that the plating coating brightness is incrementally from DC to single pulse and then to double pulse power supply gold plating.

This shows dual pulse reverse stripping gold plating for improving the crystallization is advantageous, otherwise adopting double pulse plating will not more bright than the single pulse. This should be due to that though reverse pulse not achieve anodic dissolution, but can play the role of electro-polishing, which facilitates the subsequent cathodic deposition coating pulse period is more detailed, bright.

Further, reverse pulse may also have the plating coating be more fully in the subsequent recrystallization cathode pulse period effect, and thus the plating layer coating will be finer grain.

But the reverse pulse work time shall not too long (less than 1/10 of the positive pulse time), otherwise the deposition rate is slow. Also, reverse pulse peak current density should not be less than the positive pulse, otherwise reverse electro-polishing effect is not obvious. Double pulse barre plating as well. Decorative gold plating barrel plating time is short, thin plating coating, good brightness Ni underlying coating nonfunctional requirements, so generally not suggest the use of pulse power supply plating, in order to save the cost of expensive pulse rectifier. But production practice shows that, use double pulse power supply gold plating, if select parameter properly, plating time can be shortened more than 1/3, so as to achieve the effect of the save gold.

SCR rectifier compare HF power supply

SCR rectifier compare HF power supply


In the plating industry application, normally, there are two types of rectifier, which is:

1, Silicon controlled rectifier.
2, High frequency power supply.
While, what is the different between for the 2, sometimes it will cause us confused to choose them.
Here we use a table sheet to find out what exactly difference for them.

For easy to distinguish, we choose same power: 1000A 12V type rectifier. From this, I think you will know which one is what you want.

Comparison dataSCR RectifierHF power supply
TransformerLarge volume, heavy weight, 95kgSmall volume, light weight, 1kg
Control componentsSCRIGBT
Control methodPhase-shifted triggerPWM modulation
Working frequency50Hz20KHz
Ripple ratio<5%<2%
Voltage stabilization<5%<1%
Cooling methodOil/Air coolingAir cooling
Energy savingBadEasily save power 20-40%
Interference of power gridsBig, not easy to eliminateSmall, easy to eliminate
VolumeLarge volume: 900*1010*550mmSmall volume: 520*450*220

SCR rectifier compare HF power supply

Electroplating equipment for sale

Electroplating equipment for sale

Electroplating equipment for sale

Electroplating equipment for sale:

Electroplating workshop production process can be carried out in three areas, normally as: Pre-plating surface treatment, Electro plating treatment and After electro plating treatment. Electroplating technical processes equipment generally refers to the machinery directly processing above plating parts.

Pre electroplating equipment for sale:

The main treatment processes of pre-plating surface treatment as following: polishing, brushing, tumbling, sandblasting, degreasing, rusting, anti corrosion, neutralization and cleaning. According to parts and materials, shape, surface conditions and processing requirements, select the appropriate technical steps, do necessary trimming process for electro plating parts, make sure the plating parts have a flat smooth surface, which is the important step to obtain high-quality plating film layer of plating parts. In the pre-plating pretreatment process, the main equipment used are grinding machine, polishing machine, brushing machines, sandblasting machine, tumbling machine and various fixed electro plating baths.

Electroplating equipment for sale:

Electro plating treatment is main process of entire production process. According to the requirements of electro plating parts, targeted select one or a few technical process to electroplating or dipping electro plating, to achieve purpose of anti-corrosion, abrasion and elegant appearance. Electroplating process mainly used equipments are all kinds of fixed tanks, barrel plating tanks, hanging tools, hanging baskets, etc.

After electroplating equipment for sale:

After plating treatment is the works of polishing the parts, lighting, passivation, coloring, drying, sealing, and dehydrogenation, etc., according to the need to use one or several steps to meet the quality requirements. After plating treatment process equipment are grinding machine, polishing machines, various fixed electro plating baths.

Chrome plating equipment for sale

Chrome plating equipment for sale: (Agent wanted)

Chrome plating equipment for sals

Chrome plating equipment for sale

Note: The electroplating technical processes may be different from customers to customers based on different different surface requirements and environmental conditions, please select the most suitable solution based your requirement.

1, Iron chrome plating equipment process:

Wax removal→Hot dip degreasing →Cathode→Electrolytic degreasing→Weak acid etching→Pre-plating alkaline copper→Acidic bright copper (Select) →Brightness nickel plating→Chrome electro plating or other;

Wax removal→Hot dip degreasing →Cathode→Electrolytic degreasing→Weak acid etching→Semi-bright nickel plating→High sulfur nickel electroplating→Brightness nickel plating→Nickel sealing→Chrome electro plating or other;

2, Zinc alloy chrome plating process:

Wax removal→Hot-dip degreasing→Cathode electrolysis degreasing →Pickling → → Bright copper pyrophosphate (optional) → Bright Acid Copper (optional)→Bright nickel plating→chrome electroplating;

3, Stainless steel direct chromium plating process:

1) Electrochemical degreasing→Hot water rinse→Cold water rinse→Immersion acid activation (1ml/L HCL, 10ml/L H2SO4, room temperature,half a minute; suitable for automatic on-line stainless steel chrome plating, not suitable for copper or nickel)→Water washing→Chrome electro plating.

2) Cathode electrochemical degreasing→Washing→Activation (10A/dm2)→Direct chrome plating.

3) Chemical degreasing→Washing→Anode electrochemical degreasing (0.5A/dm2)→Washing→Pickling activation (1ml/L HCL, 10ml/L H2SO4, room temperature, 45S)→Washing → Chrome plating.

Note: When chrome plating, should use of 1.5 to 2 times of normal plating current density to plate 3 to 5 minutes, then plating as normal current density, to minimize the residence time of the transition between the various processes caused.

Thank you for your interest in our chrome plating equipment, if you want to get a better understanding, such as chrome plating equipment prices, chrome plating equipment for sale, chrome equipment specification model and more information, please feel free to contact us, we will provide the best service!

Electroplating rectifier application in hard chrome plating

Electroplating rectifier application in hard chrome plating

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Electroplating rectifier application in hard chrome plating

Hard chrome plating high frequency electroplating rectifier absorb new technology, adopting international standards do 15KHz frequency pulse as signal source, and high-power IGBT soft-switching resonant converter technology, which are both in the international and domestic leading technology and unique applications constant current technology, constant current control accuracy up to 1 ‰, industry-leading, high-frequency, high-power, pulse width (big working rate) output, the cost performance is much better than similar products. Electroplating rectifier application in hard chrome metal plating case, and can be set two, three level strick hard chrome work method, so the chromium layer uniformity, strong adhesion, and can increase the thickness, showing additional advantage of energy-saving (90% efficiency), save time (takes only two-thirds of original electroplating rectifier, or even shorter), material-saving (raw material can save 30%), high efficiency (each working section can increase capacity of more than one-third).

Three phase electroplating rectifier features:

1. Electroplating rectifier machine adopts antiseptic treatment, sealed control components, each adapter sealed plastics, in order to protect them air corrosion from acid, alkali and salt, to ensure long-term stability working in corrosive environments.
2. Leading international technology, to achieve real high current, high frequency, high working rate pulse output.
3. PVC shell or spray metal shell, beautiful, will not corrode, straight cooling structure, installation and maintenance is very easy.
4. High efficiency (≥90%), a significant electricity saving (saving more than 30%) (6V1500A electroplating rectifier compare with silicon rectifier and SCR, can save electric charge more than $1600/year).
5. Variety control of constant voltage, constant current, steady current, constant power, etc.
6. Current, voltage, working time, frequency meter (optional), return meter (optional) and other all use high precision digital display, with sound and light alarm.
7. Soft start and stop function, with over current, over voltage, less voltage, over temperature, phase loss, less water, and short circuit protection function, high reliability.
8. Before delivery, our electroplating rectifier through rigorous testing and long time aging test, can be at full load day and night, uninterrupted running under high current, the failure rate is very low.
9. Adopting our electroplating rectifier, the plating layer can be more uniform, dense, good finish, enhanced the plated workpieces wear resistance.
10. Short working time, high efficiency, saving raw materials, reduce cost, will help you increase output efficiency multiplied.
11. Small size, light weight, easy delivery.

Phase electroplating rectifier main parameters:

1, Input voltage:220V/380V/440V
2, Frequency: 50Hz/60Hz
3, Efficiency:≥90%
4, Output voltage:0-15V continuously adjustable
5, Output current: 0-3000A continuously adjustable
6, Steady current accuracy:≤1 ‰
7, Steady voltage accuracy:≤1 ‰
8, Ripple wave:≤100mV
9, Insulation resistance:≥10MΩ

If hardware lock can promote vacuum ion coating equipment industry



If hardware lock can promote vacuum ion coating equipment industry:

At present, with the real estate, automobile industry development, and improvement of life level and increasing of home furnishing decoration, there will be more and more quantity demand on lock industry, which will greatly promote the market consumption upgrade, as well as encourage this locker industry make a development by leaps and bounds. So door furniture both in terms of technology, or grade, have improved a lot.

The best performance appears as double tongue safety lock, electronic password lock, spherical encryption card lock of excellent quality, high technology content of the intelligent lock come into the market.

Domestic and foreign locker products and technologies change rapidly, while lock the super gold market is gradually emit dazzling golden light.

Although the high-end locks products has become a mainstream market consumption trends, but if for further improvement, strive many aspects are needed.

In production process, shall endeavor in the issue of surface treatment and processing technology (such as by using of vacuum ion plating equipment to electroplate decorative film or functional film), then improving product durability and decorative, meanwhile to develop and apply the latest technology, materials, for energy saving, pollution reduction.

In marketing, increase efforts to adjust product structure, choosing the cut in point, lock the high-tech, high added value as a focus of research and development, the implementation of brand strategy, to further enhance brand awareness, pay close attention to quality management, conduct strict quality standard.

Nickel plating equipment

Nickel plating common fault and analysis:

Nickel plating equipment

Nickel plating equipment

Pinholes, pitting and peeling:

Electro plating coating layer has pinholes, pitting and peeling is the most common failure which mainly caused by the following reasons:

(1) Improper heat treatment process:

In the machining process, anti-rust oil, cutting fluids, lubricating oil, grease, grinding fluid, release agents and dust, grinding dust adhesion on parts surface mixed stick together, forming a thick dirt. If the heating treatment does not remove the dirt, while it will sinter to obstinate solid oil rust after degreasing and very difficult to clean, when plating, the bubbles attached on the coating layer forming gas hold-type pinhole.

(2) Poor treatment before nickel plating equipment:

Workpieces surface after heating treatment will inevitably adhere a layer of grease, when the dust accumulated on the surface and mixed with grease stick together, as a long time, it is extremely difficult to clean, so that the workpiece surface will form unconspicuous tiny oil spots, when nickel plating bubbles formed on will cause pinhole. In addtion, when using mesh belt resistance furnace for quenching, parts surface grease dirt and dust particle mix to stick together, sintering refractory solid grease, when nitrate tempering, the above grease again mix with nitro base salt to form stubborn hot polymer, while it is difficult to complete remove above durt in nickel plating equipment, in addition, hydrogen bubbles easily adhered on it, so that make the nickel plating coating layer appears pinholes and pits, and as the bubble grew bigger, the nickel electroplating layer will be automatically burst, resulting in peeling phenomenon.

Nickel plating coating layer peeling off:

Such failures have two main possible reasons:

1, Poor adhesion of the coating with substrate;
2, Nickel electro plating brittleness, small ductility.
If the heating treatment is improper, it will appear difficult to remove dirt or pre electro plating cleaning is not complete, the dirt mixed in between substrate and coating, making very poor binding force coating layer and substrate, in subsequent assembly processing, easy peeling off.
If improper ratio or poor quality brightener, PH value too high, and if the cathode current density too large and bath temperature too low, all will result in the reduction of hydrogen ions in the cathode, then the state of atomic hydrogen to penetrate into base metal and coating, make the base metal and the coating toughness decreases and cause “hydrogen embrittlement” phenomenon. In addition, when too much impurities and decomposition in the nickel solution, will also have result in “hydrogen embrittlement” phenomenon.

Poor corrosion resistance:

Because of high porosity of nickel plating layer, only when the coating thickness exceeds 25 micron, there is non-porous. Therefore, a thin layer of nickel electro plating alone can not be used as a protective coating, preferably double-nickel electroplating and multi-layer.

Green corrosion:

After nickel plating, antirust cutting fluid will be used for sealing treatment, after rust-proof cutting fluid dry, the product will be formed green negative phenomena.

Inside hole exposed copper:

Because bright nickel plating deep capacity less than cyanide plating, after nickel plating, the bright nickel plating layer can not completely cover inside hole for copper, so it will cause products unhealthy expose copper inside hole negative phenomena.