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Acid washing passivation agent for stainless steel

A passivating agent, stainless steel technology, applied in the coating process of metal materials, etc., can solve problems such as not being able to meet the needs, and achieve good results

Inactive Publication Date: 2005-07-27
HUDONG ZHONGHUA SHIPBUILDINGGROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for liquefied natural gas and nuclear power projects with higher requirements, this obviously cannot meet the needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The stainless steel pickling passivator raw material in above-mentioned embodiment 1,2,3 is prepared according to following preparation method respectively:

[0036] (1) Screen raw materials. Analyze the raw materials of ①②③④⑤, and the contents of harmful elements fluorine, chlorine, sulfur and sodium must be below 500ppm before use;

[0037] (2) The three kinds of raw materials ①②③ are mixed in the polyethylene container according to the ratio, and then adsorbed by macroporous ion resin to remove harmful elements;

[0038] (3) ④ and ⑤ two kinds of raw materials are weighed according to the proportion, then rinsed with distilled water, double anode membrane dialysis, and carry out the treatment of removing harmful elements;

[0039] (4) The results of the above two harmful element removal treatments must meet the following analysis: the content of chlorine should not exceed 95ppm; the contents of fluorine and sulfur should be below 45ppm; the content of sodium s...

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PUM

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Abstract

The present invention relates to the surface treatment of stainless steel material, and is especially one kind of stainless steel pickling deactivator. The pickling deactivator consists of nitric acid 6-20 wt%, phosphoric acid 12-35 wt%, hydrogen peroxide 5-15 wt%, zinc phosphate 15-25 wt% and magnesium nitrate 5-62 wt%. The present invention is safe, high in use effect, and suitable, especially, for use in liquefied natural gas engineering, nuclear power engineering and common engineering.

Description

Technical field: [0001] The invention relates to surface treatment of stainless steel materials, in particular to a pickling passivator for stainless steel. Background technique: [0002] The oxide layer on the surface of stainless steel is extremely hard, and it is more difficult to remove than the oxide layer on the surface of general steel. Where does the oxide scale of stainless steel come from? It is nothing more than hot rolling, heat treatment, high temperature forging, high temperature punching and drawing, electric welding and so on. Their thickness can sometimes reach 0.2-3 mm. The harm of this scale layer is too numerous to enumerate, such as affecting the appearance, reducing the corrosion resistance of the material, hindering subsequent processing, and so on. As we all know, it is a stupid way to remove this oxide layer by mechanical grinding. [0003] A long time ago, many people began to study the use of chemical methods to remove the oxide skin on the sur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/16C23G1/08
Inventor 陈时宗
Owner HUDONG ZHONGHUA SHIPBUILDINGGROUP