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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

Hard chrome machine plating process procedures

A, Plating processes introduction:

Hard chrome machine plating process procedures is a technology that coat a thick plating layer in a variety of matrix surfaces, its thickness generally more than 20μm , which making the use of chrome characteristic to improve parts performance of hardness, wear resistance , heat and corrosion resistance and other properties.

Hard chrome plating technological characteristics:

1)  Cathode current efficiency as high as 50 % to 65% , and the deposition rate very quickly;
2)  Coating layer hardness as (900 ~ 1200 HV), appear to homogeneously dense network cracks, has feature of good wear resistance;
3)  Electroplating solution dispersing ability good, coating thickness uniformity, and not easy to produce rough blister aneurysm phenomenon, which the plating layer appearance looks bright and green;
4)  The binding force between coating layer and the substrate is strong, and compare with traditional process, the pre-treatment similar and operating easier than the traditional process;
5)  Trivalent chromium content allowed tolerance in plating solution is wide, usually do not require discontinuation electrolysis to treatment trivalent chromium;
6)  Plating solution does not contain fluoride, excluding rare earth elements, and the workpiece without low zone corrosion.

Hard chromium has a very wide application, such as mechanical molds, cylinder piston, measuring, cutting and drawing tools. Its other usage is for repairing of worn parts and workpiece with excessive cutting, so that these parts can be reused.

B, Simple technical processes:

Inspection—degreasing—water washing rinse—antipole—chrome plating—water washing—testing.

C, Technological parameters:

1, Chromic anhydride:(CrO3) 220 ~ 250g/L
2, Sulfate (SO42-): 2.2 ~ 2.5g/L
3, Trivalent chromium (Cr3+): 2 ~ 5g/L
4, Plating solution temperature: 50 ~ 55℃
5, Cathode current density: 30 ~ 60A/dm2

D, Operations and precautions

1, Workpieces size inspection before plating, machining surface conditions, according to the coating thickness to calculate the plating time accurately.
2, Good controling of the electroplating solution working conditions, observation frequently, pay attention to temperature changes, level changes, careful operation, fill out the operating record. According to the result to add medicine, then correct plating solution.
3, Check the quality of the coating layer after plating, size, clean, wire teeth, inside bore and other parts rust protection. Steel workpiece strike operating grade of steel, deburring edges.
4, If the acid spilled on the skin, should immediately rinse and clean with water.

Hard chrome machine plating process procedures

Hard chrome machine plating process procedures