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Dongguan Jiayuan Hardware Products Co.,Ltd
Add:Dongguan, Guangdong, China, Changan Town, Xin'an Town, Community Village, B, No.4 Gate, Lam Tin Industrial Park, Lam Tin Road
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Die casting electroplating zinc

Die casting electroplating zinc

Die casting electroplating process for Shenzhen zinc alloy mobile phone bracket Blank inspection-mechanical polishing-polishing-gasoline scrubbing-chemical degreasing-hot water washing-washing-pickling-activation water washing-alkaline chemical nickel leaching-washing-neutral nickel plating-washing-bright nickel plating-washing-composite chromium plating-recovery-hot water washing-drying-testing

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Description: Zinc alloy die-casting key buckle can get good surface treatment.

Item:

Zinc die casting

Process   Type:

Zinc alloy Die Casting Machine drill and Electroplating

Material:

Zinc type 3

Tolerance:

±0.2MM

Surface   treatment:

Electroplating

Facility:

Zinc alloy Die Casting Machine

Certificates:

Material certificate, QC reports, Surface treatment inspection reports

Shipping:

15~20days lead time. By DHL/TNT/FedEx express, air freight etc.

Delivery & Service:

Timely delivery each time. Provide reliable service and responsible for each customer with each product. Our target is to satisfy every customer with the best service.

Die casting electroplating process for Shenzhen zinc alloy mobile phone bracket

Blank inspection-mechanical polishing-polishing-gasoline scrubbing-chemical degreasing-hot water washing-washing-pickling-activation water washing-alkaline chemical nickel leaching-washing-neutral nickel plating-washing-bright nickel plating-washing-composite chromium plating-recovery-hot water washing-drying-testing

Formulation and technological conditions of plating bath

(1) chemical degreasing

Non phosphorus washing powder (high quality) 50 ~ 80gPL, sodium carbonate 5 ~ 10gPL, 60~100 degrees, remove.

Phosphorus-free detergent powder is a kind of unique surfactant. Its main components include anionic surfactant, non-ionic surfactant, stain suspension agent, whitening agent and color protection agent. Therefore, the degreasing liquid prepared with this kind of detergent powder has the special function of removing wax and other dirt on the surface of zinc die-casting, and can quickly decompose various dirt to achieve the effect of decontamination. The workpiece can be completely removed by 5min in the slot, and it will not cause matrix corrosion and keep the surface clean and fresh. In addition, this washing powder does not cause eutrophication because it does not use phosphates as additives.

(two) pickling activation

Hydrofluoric acid 15 ~ 20mLPL, sulfuric acid 5 ~ 10mLPL, room temperature, 3 ~ 5S.

Hydrofluoric acid is a weak acid. Adding H2SO4 (or HNO3, H3BO3, etc.) into HF aqueous solution can play a stabilizing role.

(three) nickel immersion

Nickel chloride 40-50gPL, sodium citrate 90-100gPL, ammonium chloride 45-55gPL, sodium hypophosphite 10-12gPL, pH 8.5-9.5, 80-90 C, 5-10min.

There are two kinds of electroless nickel leaching: acidic and alkaline. In contrast, alkaline electroless nickel leaching is better than acidic electroless nickel leaching in the die casting of zinc alloy mobile phone support. The latter is easy to corrode the matrix, and there is a phenomenon of nickel coating, and this process overcomes this defect.

Key points of die casting operation for Shenzhen zinc alloy mobile phone bracket

1) small parts can be polished (without polishing). Suitable for grinding and polishing parts, the operation should be uniform, remove zinc casting surface thickness should not exceed the thickness of its dense layer, because the following is porous, loose structure. If the polishing force is excessive, the compact layer on the surface of the substrate will be destroyed. As a result, the polishing paste and bath liquid will enter the exposed pores and cracks, which will affect the quality of the coating.

2) polishing should be done with yellow polishing paste and then polished with white polishing paste. Use of polishing paste should be a small amount, diligent as the principle, when the amount of polishing paste will stick to the groove of the work, the hole, to the decontamination of difficulties, but not too little, otherwise, will cause local surface overheating and small pits, so that the coating bubble, peeling and other defects.

3) After grinding and polishing, the parts should be washed with gasoline as soon as possible to remove the residue of polishing paste, so as not to solidify the polishing paste and affect the quality of chemical degreasing.

4) Shenzhen zinc alloy mobile bracket die casting should use high quality washing powder (B type), small particles, large density, less foam, dissolved in water quickly, hand contact solution without burning hand, clear and smooth solution, decontamination effect is obvious. Special attention should be paid to the fact that the water temperature of the detergent with enzyme should not exceed 60 C, otherwise the enzyme will lose its activity and affect the degreasing effect. In addition, for large zinc die castings, you can wipe the oil with hand brush or dishcloth on the washing powder.


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