Super 13Cr stainless steel surface pickling treatment method

A treatment method and stainless steel technology, applied in the field of metal corrosion and protection, can solve the problems of low Cr content in the pre-passivation film, corrosion resistance damage of the pre-passivation film, etc., to improve corrosion resistance, improve corrosion resistance, reduce The effect of the probability of pitting occurrence

Pending Publication Date: 2021-12-03
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing pre-passivation process, firstly, the natural passivation film on the surface of 13Cr stainless steel is completely corroded by the pickling step, and then the passivation treatment is performed, so the pre-passivation film formed after the later passivation The Cr content is low, which will cause some damage to the corrosion resistance of the formed pre-passivation film

Method used

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  • Super 13Cr stainless steel surface pickling treatment method
  • Super 13Cr stainless steel surface pickling treatment method
  • Super 13Cr stainless steel surface pickling treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Sample preparation: process the super 13Cr stainless steel into several standard samples with a size of 40mm×10mm×3mm, rinse with clean water, and air-dry for later use;

[0036] 2) Surface cleaning: Rinse the super 13Cr stainless steel sample with distilled water, then clean it with acetone and absolute ethanol in an ultrasonic cleaner for the first time, and dry it for later use;

[0037] 3) Grinding treatment: Grind the processed super 13Cr stainless steel sample with sandpaper, and polish it with diamond polishing liquid. Then put the sample into an ultrasonic cleaner and clean it for the second time with acetone and absolute ethanol, and dry it for later use;

[0038] 4) Alkaline degreasing: The cleaned super 13Cr stainless steel sample is placed in an incubator for alkaline degreasing treatment, and the degreasing time is 5 minutes. After degreasing, rinse the sample with distilled water to remove the residual lye on the surface of the sample;

[0039] 5) Sam...

Embodiment 2

[0043] 1) Sample preparation: process the super 13Cr stainless steel into several standard samples with a size of 40mm×10mm×3mm, rinse with clean water, and air-dry for later use;

[0044] 2) Surface cleaning: Rinse the super 13Cr stainless steel sample with distilled water, then clean it with acetone and absolute ethanol in an ultrasonic cleaner for the first time, and dry it for later use;

[0045]3) Grinding treatment: Grind the processed super 13Cr stainless steel sample with sandpaper, and polish it with diamond polishing liquid. Then put the sample into an ultrasonic cleaner and clean it for the second time with acetone and absolute ethanol, and dry it for later use;

[0046] 4) Alkaline degreasing: The cleaned super 13Cr stainless steel sample is placed in an incubator for alkaline degreasing treatment, and the degreasing time is 5 minutes. After degreasing, rinse the sample with distilled water to remove the residual lye on the surface of the sample;

[0047] 5) Pick...

Embodiment 3

[0052] 1) Sample preparation: process the super 13Cr stainless steel into several standard samples with a size of 40mm×10mm×3mm, rinse with clean water, and air-dry for later use;

[0053] 2) Surface cleaning: Rinse the super 13Cr stainless steel sample with distilled water, then clean it with acetone and absolute ethanol in an ultrasonic cleaner for the first time, and dry it for later use;

[0054] 3) Grinding treatment: Grind the processed super 13Cr stainless steel sample with sandpaper, and polish it with diamond polishing liquid. Then put the sample into an ultrasonic cleaner and clean it for the second time with acetone and absolute ethanol, and dry it for later use;

[0055] 4) Alkaline degreasing: The cleaned super 13Cr stainless steel sample is placed in an incubator for alkaline degreasing treatment, and the degreasing time is 5 minutes. After degreasing, rinse the sample with distilled water to remove the residual lye on the surface of the sample;

[0056] 5) Pic...

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Abstract

The invention provides a super 13Cr stainless steel surface pickling treatment method. According to a principle that outer layer film corrosion is firstly carried out and then inner layer film corrosion is carried out in pickling treatment, proper pickling solution concentration and pickling time are controlled, so that pickling is controlled in a stage that the outer layer film corrosion is completed and an inner layer film is not corroded; and therefore, a C-rich oxide layer of the inner layer of a natural passivation film can be reserved, and the content of Cr element on the surface of the material is obviously increased. As Cr is an effective element for preventing corrosion, a pre-passivation film is prepared on the basis of Cr, the pre-passivation film covers a matrix and surface defects of the matrix, so that the uniform corrosion rate can be obviously reduced, the corrosion resistance is improved, local corrosion can be effectively inhibited, the probability of pitting corrosion can be greatly reduced, and the problem of stress corrosion cracking caused by 13Cr stainless steel surface pitting corrosion is solved.

Description

technical field [0001] The invention relates to the field of metal corrosion and protection, in particular to a super 13Cr stainless steel surface pickling treatment method. Background technique [0002] With the development of oil and gas fields, the service environment of pipes is becoming more and more severe, and super 13Cr martensitic stainless steel with high corrosion resistance has become a 2 CO of S 2 The material of choice for service in the environment. 13Cr martensitic stainless steel will be naturally passivated in the air to form a dense passivation film, which effectively improves its corrosion resistance. [0003] Usually, the thickness of the natural passivation film on the surface of stainless steel is 1-3nm. Nano-scale films can significantly improve their corrosion resistance, but if the thickness of the passivation film can be increased, the corrosion resistance of stainless steel will be further improved. Austenitic stainless steel adopts pre-passiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08
CPCC23G1/081
Inventor 董会罗卓韩燕周勇李霄王丽爽姚建洮孙良翟文彦
Owner XI'AN PETROLEUM UNIVERSITY
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