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Roller plating process of trivalent yellow zinc

A yellow zinc and process technology, applied in the direction of metal material coating process, etc., to achieve the effect of improving the passivation effect

Inactive Publication Date: 2019-08-30
NINGBO YADA METAL SURFACE TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the barrel plating process of trivalent yellow zinc

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0040] Examples 1-5 are used to illustrate the components of the passivating agent. Examples 1-5 Passivator components are shown in Table 1.

[0041] Table 1, embodiment 1-5 passivating agent component table

[0042] Example 1 Example 2 Example 3 Example 4 Example 5 Chromium chloride / part 5 6 7 8 7 Sodium nitrate / part 18 19 20 21 22 Sodium fluoride / part 8 12 9 10 11 Nickel sulfate / part 45 35 37 40 43

[0043] Note: The unit "part" refers to parts by weight.

[0044] In combination with Table 1, the preparation method of the passivating agent aqueous solution is described in detail below.

[0045] A method for preparing an aqueous solution of a passivating agent, comprising the steps of: weighing chromium chloride, sodium nitrate, sodium fluoride and nickel sulfate according to parts by weight, mixing them uniformly, adding them to 1000 parts by weight of water, stirring and dissolving .

[0046] Examples 6-10 i...

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PUM

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Abstract

The invention discloses a roller plating process of trivalent yellow zinc. The roller plating process comprises the following steps of raw material purchasing, feeding, chemical oil removal, water washing, electrolysis oil removal, water washing, acid washing, water washing, electrolysis oil removal, water washing, activation, water washing, alkali soaking, electroplating, water washing, film thickness inspection, transferring, light emitting, water washing, passivation, water washing, spin drying, sealing, drying, discharging, final inspection, packaging and storage, wherein in the passivation step, the raw materials subjected to the light-out water washing are added into a passivating agent aqueous solution for passivating, the pH value is controlled to be 1.6-2.0, the temperature is 24-35 DEG C, the soaking time of the passivating agent is 45-100 s, and the air stirring pressure is 0.4 MPa; and the passivating agent comprises the following components in parts by weight: 5-8 parts ofchromium chloride and 18-22 parts of sodium nitrate, 8-12 parts of sodium fluoride, and 35-45 parts of nickel sulfate. The process has the beneficial effects that hexavalent chromium in the passivating agent can be replaced with trivalent chromium to produce the yellow zinc, so that the characteristics of environmental friendliness and low toxicity are achieved.

Description

technical field [0001] The invention relates to a barrel plating process, in particular to a barrel plating process of trivalent yellow zinc. Background technique [0002] Galvanizing refers to a surface treatment technology that coats a layer of zinc on the surface of metals, alloys or other materials for aesthetics and anti-rust effects. In the galvanizing process, people need to passivate the zinc layer to form a chromate conversion film on the surface of the zinc layer, thereby reducing the chemical activity of zinc. The passivation of the zinc layer requires the use of a passivation solution. Because of the high toxicity of hexavalent chromium in the original passivation solution, people began to study trivalent chromium instead of hexavalent chromium. [0003] Publication number is that the Chinese patent of CN106086951A discloses a kind of barrel plating method of trivalent colored zinc. This barrel plating method comprises the following steps: [0004] The first ...

Claims

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Application Information

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IPC IPC(8): C23C22/34C23C22/73
CPCC23C22/34C23C22/73C23C2222/10C23C2222/20
Inventor 董阿能秦利军
Owner NINGBO YADA METAL SURFACE TREATMENT
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