Rare-earth passivation method for improving corrosion resistance of chromium carbide coating on stainless steel surface

A surface carbonization and stainless steel technology, applied in the passivation treatment of chromium carbide coating on the surface of stainless steel, and the treatment of chromium carbide coating on the surface of stainless steel, can solve the problems of rare reports, difficult process control, high production cost, etc., to improve corrosion resistance The effect of high reliability, low processing cost and simple passivation process

Inactive Publication Date: 2013-04-03
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the prior art are: high production cost, difficult to control the process
Although Zhang Yingjie and others proposed the preparation process of "a clean rare earth passivation film (application number: 200910094369.2)", this process is mainly aimed at the post-treatment process of electrogalvanizing or zinc-iron alloys for steel parts; Aluminum Alloy Rare Earth Passivation Solution with Chloride Salt and Its Application (Application No.: 201110211226.2)” focuses on the rare earth passivation process of aluminum alloys; for magnesium alloys, Chen Long proposed “Magnesium alloy surface rare earth treatment process ( 200610036818.4)"; there are few reports on the treatment methods for improving the chromium carbide layer of stainless steel

Method used

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  • Rare-earth passivation method for improving corrosion resistance of chromium carbide coating on stainless steel surface
  • Rare-earth passivation method for improving corrosion resistance of chromium carbide coating on stainless steel surface
  • Rare-earth passivation method for improving corrosion resistance of chromium carbide coating on stainless steel surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 40g / L KMnO with a pH value of 6 at 80°C for the chromium carbide-plated stainless steel plate after pretreatment 4 +5g / LCe(NO 3 ) 3 ·6H 2 O+100g / L Mg(NO 3 ) 2 In the rare earth passivation solution, passivate for 8 minutes, rinse it with deionized water and dry it after taking it out. 0.5mol / L H of the sample at 80°C before and after treatment 2 SO 4 The polarization curve in solution is as figure 1 , the corrosion resistance of chromium carbide plated stainless steel after passivation treatment is improved by nearly 1 order of magnitude.

Embodiment 2

[0027] The pretreated chromium carbide plated stainless steel plate is 40g / L KMnO with a pH value of 3 at 70°C 4 +25g / LCe(NO 3 ) 3 ·6H 2 O+50g / L Mg(NO 3 ) 2 In the rare earth passivation solution, passivate for 4 minutes, rinse with deionized water and dry after taking it out. 0.5mol / L H of the sample at 80°C before and after treatment 2 SO 4 The polarization curve in solution is as figure 2 , the corrosion current density of chromium carbide-plated stainless steel after passivation treatment is reduced by nearly 1 order of magnitude.

Embodiment 3

[0029] The pretreated chromium carbide plated stainless steel plate is 25g / L KMnO with a pH value of 5 at 40°C 4 +20g / L Ce(NO 3 ) 3 ·6H 2 O+100g / L Mg(NO 3 ) 2 In the rare earth passivation solution, passivate for 10 minutes, rinse with deionized water and dry after taking it out. 0.5mol / L H of the sample at 80°C before and after treatment 2 SO 4 The polarization curve in solution is as image 3 , Passivation treatment significantly reduces the corrosion current density of chromium carbide-plated stainless steel.

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PUM

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Abstract

The invention provides a rare-earth passivation method for improving the corrosion resistance of a chromium carbide coating on a stainless steel surface, comprising the following steps of: carrying out deoiling and degreasing treatment on stainless steel plated with chromium carbide, and carrying out rare-earth passivation treatment. The rare-earth passivation method is characterized in that the rare-earth passivation treatment is that the stainless steel plated with the chromium carbide, which is subjected to the deoiling and degreasing treatment, is placed into a rare-earth passivation solution of KMnO4+Ce(NO3)3.6H2+Mg(NO3)2; then steps of washing and drying are carried out to obtain the passivated stainless steel plated with the chromium carbide. The rare-earth passivation method disclosed by the invention has the beneficial effects that simple passivation process, low machining cost, no pollution to the passivation solution and no influences on mechanical properties of the stainless steel plated with the chromium carbide. Meanwhile, a passivation process can obviously improve the corrosion resistance of the stainless steel plated with the chromium carbide.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface treatment, and in particular relates to a treatment method for a chromium carbide coating on the stainless steel surface, in particular to passivation treatment of the chromium carbide coating on the stainless steel surface with a chemical treatment solution containing rare earth ions. Background technique [0002] Stainless steel is one of the most widely used metal materials in industry. In order to adapt to different application fields, different methods are often used for surface treatment. Chromium carbide-based coatings are widely used as coatings for textile machinery, sliding bearings, cutting tools, etc. made of stainless steel because of their high hardness, good friction and wear properties, and high-temperature oxidation resistance. [0003] Although chromium carbide-based coatings have been widely used in modern industry, there are always some micropores in the film la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50
Inventor 黄乃宝梁成浩于宏裴丽琳王源
Owner DALIAN MARITIME UNIVERSITY
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