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Galvanized colored passivation solution and passivation process thereof

A passivation solution and solution technology, applied in the direction of metal material coating process, etc., can solve the problems of scratches, poor passivation film firmness, inconsistent appearance of parts, etc., to ensure stability, strong corrosion resistance, and appearance consistency. Good results

Pending Publication Date: 2021-10-26
GUIZHOU AEROSPACE PRECISION PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adopt [dichromate, sulfuric acid] type formula, after the product is passivated, the passivation film is not fast enough, the parts rub against each other, and the surface of the parts will be scratched by the passivation film, causing the appearance of the parts to be inconsistent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A galvanized color passivation solution, comprising components: sodium dichromate, sulfuric acid, ferrous sulfate; the content of each component distribution ratio of the passivation solution per liter of passivation solution is: sodium dichromate 162.5 g / L, sulfuric acid 9.65ml / L, ferrous sulfate 1.55g / L, the rest is deionized water or distilled water.

[0037] Adopt above-mentioned galvanized color passivation solution to carry out color passivation to galvanized part, described galvanized part is the galvanized part of cyanide galvanizing, specifically comprises the following steps:

[0038] Step S1: Pretreatment of galvanized parts: wash the galvanized parts that have just been galvanized with water, clean them after being exposed to light, and dry them for later use;

[0039] Step S2: Configuration of the passivation solution: measure the volume of the tank body, and the content of each liter of passivation solution according to the distribution ratio of each compo...

Embodiment 2

[0043] A galvanized color passivation solution, comprising components: sodium dichromate, sulfuric acid, ferrous sulfate; the content of each component distribution ratio of the passivation solution in every liter of passivation solution is: sodium dichromate 152g / L, sulfuric acid 11.6ml / L, ferrous sulfate 1.35g / L, the rest is deionized water or distilled water.

[0044] Adopt above-mentioned galvanized color passivation solution to carry out color passivation to galvanized part, described galvanized part is the galvanized part of cyanide-free galvanized, specifically comprises the following steps:

[0045] Step S1: Pretreatment of galvanized parts: wash the galvanized parts that have just been galvanized with water, clean them after being exposed to light, and dry them for later use;

[0046]Step S2: configuration of the passivation solution: measure the volume of the tank body, and the content in each liter of passivation solution according to the distribution ratio of each...

Embodiment 3

[0050] A galvanized color passivation solution, comprising components: sodium dichromate, sulfuric acid, ferrous sulfate; the content of each component distribution ratio of the passivation solution in every liter of passivation solution is: sodium dichromate 175g / L, sulfuric acid 9.0ml / L, ferrous sulfate 1.65g / L, the rest is deionized water or distilled water.

[0051] Adopt above-mentioned galvanized color passivation solution to carry out color passivation to galvanized part, described galvanized part is the galvanized part of cyanide-free alkaline galvanized, specifically comprises the following steps:

[0052] Step S1: Pretreatment of galvanized parts: wash the galvanized parts that have just been galvanized with water, clean them after being exposed to light, and dry them for later use;

[0053] Step S2: configuration of the passivation solution: measure the volume of the tank body, and the content in each liter of passivation solution according to the distribution rati...

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PUM

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Abstract

The invention relates to a galvanized colored passivation solution. The galvanized colored passivation solution comprises the following components: sodium dichromate, sulfuric acid and ferrous sulfate; each liter of the passivation solution comprises the following components by weight: 152-175 g / L of sodium dichromate; 8.5-11.6 ml / L of sulfuric acid; 1.2-1.8 g / L of ferrous sulfate; and the balance of deionized water or distilled water. The invention further discloses a passivation process for performing color passivation on a galvanized part by adopting the galvanized color passivation solution. According to the passivation solution and the passivation process thereof, the sodium dichromate serves as a main component in the passivation process; the sulfuric acid plays a role in catalysis in the passivation process, so that a film is quickly formed on the surface of the part; and the ferrous sulfate reduces hexavalent chromium in the passivation solution into trivalent chromium, the content of the trivalent chromium in passivation is kept constant, the stability of solution components is guaranteed, then the appearance consistency of the part after passivation is good, the corrosion resistance of a passivation film is high, and the time for the passivation film to produce white rust in a neutral salt spray test can reach 96 hours or above.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a galvanized colored passivation solution and a passivation process thereof. Background technique [0002] As a commonly used and effective metal protection method, the color passivation process of galvanized layer is widely used in occasions with special requirements for the passivation appearance color of metal components. Passivation treatment belongs to a chemical conversion film technology, which changes the surface state of the metal through chemical or electrochemical means, so that the electrode potential of the metal leaps forward to the positive direction, becoming a corrosion-resistant passive state, showing corrosion-resistant performance , this layer of film is called passivation film. According to the different appearance and color of the galvanized passivation film, the galvanized passivation process can be roughly divided into: (blue) white passiv...

Claims

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Application Information

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IPC IPC(8): C23C22/30C23C22/73C23C22/82
CPCC23C22/30C23C22/73C23C22/82
Inventor 代文彪李意刚杨颖王文娟
Owner GUIZHOU AEROSPACE PRECISION PRODS
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