Process for treating surface of austenitic stainless steel equipment at normal temperature

A technology for austenitic stainless steel and equipment, which is applied in the field of anti-corrosion treatment process for the surface of austenitic stainless steel equipment. the effect of the requirements

Pending Publication Date: 2022-03-01
SHENZHEN CANDORTECH INC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the martensite in austenitic stainless steel can be eliminated by solution treatment, but the temperature range of solution treatment is about 980-1250°C, which is relatively high and will greatly increase the production cost And the safety hazards of high temperature production

Method used

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  • Process for treating surface of austenitic stainless steel equipment at normal temperature
  • Process for treating surface of austenitic stainless steel equipment at normal temperature
  • Process for treating surface of austenitic stainless steel equipment at normal temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Acidification ointment formula optimization experiment

[0033] The product specification of 304 workpiece: 0.2*50*50mm (thickness*length*width), the residual martensite on the surface is 4.05%. The formula of acidifying cream is shown in Table 1. The experimental method is as follows:

[0034] (1) brushing the acidifying paste of formula shown in table 1 to the thickness of 2mm on the surface of 304 workpieces, carrying out acidizing treatment for 80 minutes, then washing with water for 3 minutes;

[0035] (2) Then carry out brush plating to the workpiece after step (1) processing, 304 workpieces are connected power supply negative pole, brush plating pen is connected power supply positive pole, and the brush plating nib adopts graphite material outsourcing anode cloth; Brush plating liquid composition comprises CrO 3 100g / L, Na 2 MoO 4 100g / L, H 3 PO 4 200g / L; brush plating current density 600A / m2 , When brush plating, put the brush plating hea...

Embodiment 2

[0040] Embodiment 2: acidification process parameter optimization experiment

[0041] The product specification of 304 workpiece: 0.2*50*50mm (thickness*length*width), the residual martensite on the surface is 4.05%. Acidification was carried out according to the process parameters shown in Table 2. The experimental method is as follows:

[0042] (1) brushing the acidifying paste consisting of 25% industrial nitric acid, 25% industrial hydrofluoric acid, 30% barium sulfate and 20% deionized water to the surface of 304 workpieces for acidification, and then washing for 3 minutes;

[0043] (2) Then carry out brush plating to the workpiece after step (1) processing, 304 workpieces are connected power supply negative pole, brush plating pen is connected power supply positive pole, and the brush plating nib adopts graphite material outsourcing anode cloth; Brush plating liquid composition comprises CrO 3 100g / L, Na 2 MoO 4 100g / L, H 3 PO 4 200g / L; brush plating current d...

Embodiment 3

[0047] Embodiment 3: brush plating process parameter optimization experiment

[0048] The product specification of 304 workpiece: 0.2*50*50mm (thickness*length*width), the residual martensite on the surface is 4.05%. The experimental method is as follows:

[0049] (1) Brush the acidizing paste consisting of 25% industrial nitric acid, 25% industrial hydrofluoric acid, 30% barium sulfate and 20% deionized water to a thickness of 2mm on the surface of the 304 workpiece, and carry out acidizing treatment for 80 minutes , then wash with water for 3 minutes;

[0050] (2) Then the 304 workpiece is connected to the negative pole of the power supply, the brush plating pen is connected to the positive pole of the power supply, and the brush plating pen head is made of graphite material to outsource the anode cloth; the composition of the brush plating solution includes CrO 3 100g / L, Na 2 MoO 4 100g / L, H 3 PO 4 200g / L; Carry out brush plating according to the parameter shown ...

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Abstract

The invention provides a process for treating the surface of austenitic stainless steel at normal temperature, which comprises the following steps: (1) brushing acidizing paste on the surface of an austenitic stainless steel workpiece to be treated, acidizing to eliminate residual martensite on the surface of the austenitic stainless steel workpiece, and then washing with water; (2) a brush plating pen connected with the positive electrode of a power source is adopted for brush plating of brush plating liquid to the surface of the austenitic stainless steel workpiece which is connected with the negative electrode of the power source and treated in the step (1), after brush plating is completed, residual liquid on the surface of equipment is cleaned up, and then washing is conducted; and (3) the austenitic stainless steel equipment treated in the step (2) is placed in the environment with the temperature being 50-60 DEG C and the humidity being 60-70% for hardening treatment.

Description

technical field [0001] The invention relates to a process for treating the surface of austenitic stainless steel equipment at normal temperature. More specifically, the present invention relates to an anti-corrosion treatment process for the surface of austenitic stainless steel equipment used in high corrosion environments in the fields of petrochemical, petroleum refining, oil and gas industries, etc. Background technique [0002] Corrosion is a process in which a material degrades or fails by reacting with its environment. Metals, plastics, and ceramics are all materials that can be corroded. Corrosion most commonly refers to the chemical or electrochemical oxidation of metals. In petrochemical, petroleum refining, oil and gas industries and other fields, due to impurities such as sulfur elements, chloride ions, and organic acids in crude oil, related equipment is in a relatively high corrosive medium environment. The decline of crude oil quality will make the corrosiv...

Claims

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Application Information

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IPC IPC(8): C25D5/06C25D5/36C25D5/48C23F1/28
CPCC25D5/06C25D5/36C25D5/48C23F1/28Y02P10/20
Inventor 肖剑鸣赵向云汪文发陈超
Owner SHENZHEN CANDORTECH INC CO
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