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A kind of metal surface is plated zinc-nickel alloy and the method for trivalent chromium passivation

A metal surface, zinc-nickel alloy technology, applied in the field of metal surface plating zinc-nickel alloy and trivalent chromium passivation, can solve the problems of limited corrosion resistance, environmental pollution, etc., to achieve corrosion resistance and enhanced protection, plating decoration layer uniform effect

Inactive Publication Date: 2011-11-30
NANTONG SHENHAI SCI & IND TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the limited corrosion resistance of the protective coating of hexavalent chromium on the surface of existing metal parts and the disadvantages of easily causing environmental pollution and inducing cancer, the invention provides a method for plating zinc-nickel alloy and trivalent chromium on the metal surface to make the coating The ability of corrosion resistance and protection is enhanced, the coating is uniform and consistent, and it can resist strong corrosion such as various high-temperature salt sprays. During the plating process, no highly carcinogenic hexavalent chromium is produced, which significantly reduces and improves environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment

[0034] Example 1 2 3 4 5

[0035] NaOH 6 24 8 13 9

[0036] Na 2 CO 3 10 35 18 25 13

[0037] Na 3 PO 4 8 49 35 12 24

[0038] (2) remove surface scale and rust, carry out in hydrochloric acid HCl solution, its concentration (gram / liter) is:

[0039] Example 1 2 3 4 5

[0040]HCl 10 48 35 24 15

[0041] (3) Electrodegreasing, in sodium hydroxide NaOH, sodium carbonate Na 2 CO 3 and trisodium phosphate Na 3 PO 4 Carry out in mixed solution, the concentration of this mixed solution is identical with above-mentioned step (1);

[0042] (4) surface activation treatment, in sulfuric acid H 2 SO 4 Carry out in the solution, its concentration (gram / liter) is:

[0043] Example 1 2 3 4 5

[0044] h 2 SO 4 7 50 8 18 25

[0045] (5) Galvanized iron, in zinc sulfate ZnSO 4 , nickel sulfate NiSO 4 Carry out in mixed solution with sodium hydroxide NaOH, the concentration (gram / liter) of this mixed solution is:

[0046] Example 1 2 3 4 5

[0047] ZnSO 4 ...

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PUM

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Abstract

The invention discloses a method for plating zinc-nickel alloy and trivalent chromium passivation on the metal surface, which is characterized in that it is processed through the following process steps: (1) removing surface grease, (2) removing surface oxide scale and rust, (3) ) electrolytic degreasing, (4) surface activation treatment, (5) galvanized nickel plating, (6) trivalent chromium plating passivation treatment, (7) sealing treatment, (8) finished product drying, inspection and packaging for storage. The method of the invention is applied to the corrosion-resistant and anti-corrosion coating treatment on the surface of metal parts such as automobiles, motorcycles and other parts. Its advantages are that the coating is uniform, firm, smooth, and has strong corrosion resistance. It can resist various strong corrosion in various harsh environments such as high temperature and salt spray. It has a long service life and significantly reduces and improves environmental pollution.

Description

technical field [0001] The invention relates to a method for plating zinc-nickel alloy and trivalent chromium passivation on the surface of metal materials. Background technique [0002] At present, for the corrosion resistance surface treatment of metal parts, the general traditional method is to use galvanizing and hexavalent chromium plating passivation treatment. Although it can play a certain role in corrosion resistance protection, its disadvantage is that the corrosion resistance is limited. The appearance of the treated parts is blurred and the surface is dull. What is more serious is that electroplating hexavalent chromium is highly mutagenic and carcinogenic, which has a great impact on the environment and human health. Contents of the invention [0003] In order to overcome the limited corrosion resistance of the protective coating of hexavalent chromium on the surface of existing metal parts and the disadvantages of easily causing environmental pollution and in...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/48
Inventor 仇士学陶云峰蔡宪成陈建敏
Owner NANTONG SHENHAI SCI & IND TECHCO
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