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Solution for dissolving color-coating hot dip galvanizing substrate chromate conversion coating

A technology of substrate chromate and hot-dip galvanizing, applied in the field of detection, can solve the problems of poor reproducibility and large error of detection results, and achieve the effects of reducing errors, improving accuracy and solving reduction problems.

Inactive Publication Date: 2007-11-28
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the detection process, it was found that when the chromate conversion coating was dissolved, elements such as zinc on the substrate were also dissolved one after another, and the potential potential of these elements was different from that of chromium. φ Cr 6 + / Cr 3 + θ = + 1.33 , Therefore, hexavalent chromium is extremely prone to reduction reactions, resulting in large errors in test results and poor reproducibility

Method used

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  • Solution for dissolving color-coating hot dip galvanizing substrate chromate conversion coating

Examples

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Effect test

Embodiment 1

[0011] ① Take 30ml of 0.08% buffer (sodium hydroxide);

[0012] ②Take 30ml of 0.3% corrosion inhibitor (sodium silicate);

[0013] ③Mix the above two solutions and shake well to make a solution for dissolving the chromate conversion coating on the hot-dip galvanized substrate for color coating.

Embodiment 2

[0015] ① Take 0.02% buffer (potassium hydroxide) 30ml;

[0016] ②Take 30ml of 0.8% corrosion inhibitor (hexamethylenetetramine);

[0017] ③ Dissolve 0.1 gram of additive (sodium carbonate) in the solution ①;

[0018] ④Mix the above solution ① and solution ②, and shake well to make a solution for dissolving the chromate conversion coating on the hot-dip galvanized substrate for color coating.

Embodiment 3

[0020] ① Take 0.05% buffer (potassium hydroxide) 50ml;

[0021] ②Take 10ml of 0.9% corrosion inhibitor (sodium dodecylsulfonate);

[0022] ③Mix the above two solutions and shake well to make a solution for dissolving the chromate conversion coating on the hot-dip galvanized substrate for color coating.

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Abstract

The invention provides a solution for dissolving chromate conversion coating of color-coating hot dip galvanizing base plate. The solute in solution comprises 0.01%-0.1% by wt of alkaline buffering agent and 0.01-0.1% by wt of zinc alkaline corrosion inhibitor. The solvent is distilled water. The alkaline buffering agent comprises di-sodium hydrogen phosphate, sodium hydroxide and one of potassium hydroxide or sodium bicarbonate. The zinc alkaline corrosion inhibitor comprises hexamethylene tetramine, sodium silicate and one of sodium dodecyl benzene sulfonate or sodium dodecyl sulfonate. The solution of invention can also comprises 0.001%-0.5% by wt of additive. The additive comprises sodium carbonate and one of cupferron or zinc oxide. Compared with prior technology, the invention solves reconstruction problem of hexavalent chromium in the dissolving process, avoids reducing of hexavalent chromium content, improves accuracy of measuring result; makes error of measuring result decrease by more than 80%, and possesses higher economical and social benefits.

Description

technical field [0001] The invention belongs to detection technology, and in particular relates to a solution for dissolving chromate conversion film on a hot-dip galvanized substrate for color-coated steel sheets. Background technique [0002] Before the color-coated steel sheet is coated with organic coatings, in order to improve the corrosion resistance of the color-coated steel sheet and enhance the bonding force between the hot-dip galvanized substrate and the organic coating, the hot-dip galvanized substrate for color coating is usually passivated deal with. For a long time, passivation treatment often uses chromate treatment solution containing hexavalent chromium. The chromate passivation process containing hexavalent chromium is simple, low in cost, and the passivation film has a good protective effect on the metal substrate, but hexavalent chromium is highly toxic. With the strengthening of people's environmental awareness, the monitoring of hexavalent chromium co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00G01N1/28G01N21/25
Inventor 陈义庆徐小连徐承明王杰杨丽荣肖宇
Owner ANGANG STEEL CO LTD
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