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Metal coating corrosive liquid

A metal coating and etching solution technology, applied in the preparation of test samples, etc., can solve the problems of difficult to ensure stable corrosion reaction, corrosion of silicon-zirconium alloy coating, difficult to control reaction speed, etc., to facilitate observation and research, corrosion The effect of smooth speed and clear corrosion boundary

Inactive Publication Date: 2017-09-26
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing types of corrosive liquids have the following disadvantages: 1) During the working process of corrosive liquids, most of the corrosive liquids use strong acids and strong oxidizing accelerators, and the reaction speed is difficult to control, which will quickly corrode to the substrate layer
2) During the working process of the corrosive solution, the pH value of the working solution will decrease rapidly with the progress of the reaction, and it is difficult to ensure the stable progress of the corrosion reaction
3) During the working process of the corrosive solution, if the metal coating is a silicon-zirconium alloy layer, it is difficult for the existing acidic corrosive solution to corrode the silicon-zirconium alloy coating. Generally, an alkaline corrosive solution is used for corrosion, but the alkaline corrosive solution Easily absorb CO in the air 2 deteriorating and difficult to store for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] We measure 10 mL of deionized water, slowly add 30 mL of orthophosphoric acid with a mass fraction of 85% to it, mix well, and then slowly add 30 mL of a prepared aqueous solution of sodium dihydrogen phosphate with a mass fraction of 29%, Mix well and let it stand. When the solution no longer continues to layer, add 10 mL of hydrofluoric acid and 20 mL of ethylene glycol, and stir to make the solution evenly mixed. The obtained solution is a metal plating corrosion solution.

[0016] Take a small amount (1 drop -5 drops) of metal plating corrosion solution, drop it on the surface of the chrome-plated metal plating layer containing hexavalent chromium, and after a while (2 s -10 s), add the reagent containing hexavalent chromium color solution to it, the metal The liquid on the surface of the coating has an obvious color reaction, which proves that a metal coating corrosion solution has an effective corrosion effect.

Embodiment 2

[0018] We measured 35 mL of deionized water, and slowly added 30 mL of the prepared aqueous solution of sodium dihydrogen phosphate with a mass fraction of 29%, mixed well, and slowly added 25 mL of sulfuric acid with a mass fraction of 98% while stirring, and let it stand , After the solution is cooled, when the layering is no longer continued, add 5 mL of hydrofluoric acid and 5 mL of ethylene glycol to it, and stir to make the solution evenly mixed. The obtained solution is a metal plating corrosion solution.

[0019] Take a small amount (1 drop -5 drops) of metal plating corrosion solution, drop it on the surface of the chrome-plated metal plating layer containing hexavalent chromium, and after a while (2 s -10 s), add the reagent containing hexavalent chromium color solution to it, the metal The liquid on the surface of the coating has an obvious color reaction, which proves that a metal coating corrosion solution has an effective corrosion effect.

Embodiment 3

[0021] We measure 50 mL of deionized water, slowly add 15 mL of orthophosphoric acid with a mass fraction of 85% to it, mix well, and then slowly add 25 mL of a prepared aqueous solution of sodium dihydrogen phosphate with a mass fraction of 29%, Mix well and let it stand. When the solution no longer continues to layer, add 5 mL of hydrofluoric acid and 5 mL of ethylene glycol, and stir to make the solution evenly mixed. The obtained solution is a metal plating corrosion solution.

[0022] Take 1 drop of metal plating corrosion solution and drop it on the surface of the zinc-containing metal coating. After 10 s, wash the surface of the metal coating with deionized water to clean the corrosion solution. Afterwards, the surface of the coating was dried, and the fluorescence intensity of the zinc element at the corroded part was measured with an X-ray fluorescence spectrometer, and the reading was recorded. Repeat the above steps to measure the fluorescence intensity of the zinc...

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Abstract

The invention relates to metal coating corrosive liquid. The metal coating corrosive liquid is composed of a corrosive agent, a buffering agent, an accelerant, a stabilizing agent and a dissolving agent. The metal coating corrosive liquid is characterized in that the corrosive agent is orthophosphate, the buffering agent is sodium dihydrogen phosphate, the accelerant is hydrofluoric acid, the stabilizing agent is glycol, the dissolving agent is deionized water; and during preparation, the volume percents of the components are as follows: the corrosive agent accounts for 15%-30%, the mass percent of the corrosive agent is 85%, the buffering agent accounts for 15%-30%, the mass percent of the buffering agent is 29%, the accelerant accounts for 5%-10%, the mass percent of the accelerant is 40%, the stabilizing agent accounts for 5%-20%, and the balance the dissolving agent. According to the metal coating corrosive liquid, the orthophosphate and sulfuric acid are adopted as the corrosive agent, the corrosive progress is relatively mild, meanwhile, the glycol serves as the stabilizing agent in the reaction process, the speed of a corrosion reaction can be effectively reduced, the corrosive progress is controlled more easily, and the corrosion speed is uniform and stable.

Description

technical field [0001] The invention relates to a metal coating corrosion solution and the field of metal coating corrosion. Background technique [0002] In the process of researching and testing the metal coating on the surface of metal materials or the detection of hexavalent chromium, we need to corrode and destroy the metal coating, and then observe the corroded surface or test the corroded solution. Hexavalent chromium content was tested. At this time, we will use the metal plating corrosion solution to corrode the metal plating material. [0003] The existing types of corrosive liquids have the following disadvantages: 1) During the working process of corrosive liquids, most of the corrosive liquids use strong acids and strong oxidizing accelerators, and the reaction speed is difficult to control, which will quickly corrode to the substrate layer . 2) During the working process of the corrosive solution, the pH value of the working solution will decrease rapidly wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/16G01N1/32
CPCC23F1/16G01N1/32
Inventor 姜伟男王慧娟王静孙硕应坤
Owner CHINA FIRST AUTOMOBILE
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