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A surface treatment method for austenitic stainless steel corrosion-resistant reinforced parts

A technology of austenitic stainless steel and surface treatment, applied in the direction of solid-state diffusion coating, coating, metal material coating process, etc., can solve the problems of color change, environmental pollution, low pass rate, etc., and achieve polishing precision High, expand the use range, improve the effect of hardness

Active Publication Date: 2020-06-02
WUHAN HGLASER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the poor polishing effect, low qualified rate and environmental pollution of existing mechanical polishing and electrochemical polishing processes, as well as the fact that conventional nanosecond lasers can change the color of austenitic stainless steel carburized parts and cannot be used in austenitic stainless steel. The surface of the body stainless steel is bright white, which is difficult to meet the color requirements

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  • A surface treatment method for austenitic stainless steel corrosion-resistant reinforced parts
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Examples

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Embodiment 1

[0032] Such as figure 1 As shown, this embodiment provides a surface treatment method for 304 austenitic stainless steel corrosion-resistant reinforced parts, and the specific process is as follows:

[0033] First, use ultrasonic wave + degreasing agent to remove grease and stains on 304 austenitic stainless steel, dry the surface and put it into a low-pressure atmosphere furnace (about 100Pa); HCl+20%CF 4 Pretreat 304 austenitic stainless steel with mixed gas, keep it warm for 1 hour, fully remove the protective film on the surface of 304 austenitic stainless steel and form Fe chloride on the surface of austenitic stainless steel, which is conducive to carburization; after pretreatment is completed , the low-pressure atmosphere furnace is heated to 490°C for pre-carburizing treatment of 304 austenitic stainless steel, and the carburizing atmosphere is 20%CO+15%H 2 +60%N 2 , with a balance of CO 2, the pre-carburization time is 1h, so that the lower limit area of ​​carbon ...

Embodiment 2

[0036] Such as figure 1 As shown, this embodiment provides a surface treatment method for 316 austenitic stainless steel corrosion-resistant reinforced parts, and the specific process is as follows:

[0037] First, use ultrasonic wave + degreasing agent to remove grease and stains on 316 austenitic stainless steel. After drying the surface, put it into a low-pressure atmosphere furnace (about 1000Pa). %CF 4 Pretreat 316 austenitic stainless steel with mixed gas, keep it warm for 1 hour, fully remove the protective film on the surface of 316 austenitic stainless steel and form Fe chloride on the surface of austenitic stainless steel, which is conducive to the progress of carburization; after the pretreatment is completed , raise the temperature of the low-pressure atmosphere furnace to 500°C to pre-carburize 316 austenitic stainless steel, and the carburizing atmosphere is 20%CO+25%H 2 +45%N 2 , Yu CO 2 , the pre-carburization time is 1h, so that the lower limit area of ​​c...

Embodiment 3

[0040] Such as figure 1 As shown, this embodiment provides a surface treatment method for the corrosion-resistant reinforcement of 201 austenitic stainless steel, and the specific process is as follows:

[0041] First, use ultrasonic wave + degreasing agent to degrease and dry 201 austenitic stainless steel, put it into a low-pressure atmosphere furnace (about 600Pa), raise the temperature of the low-pressure atmosphere furnace to 285°C, and use 80%HCl+20%CF 4 Pretreat 201 austenitic stainless steel with mixed gas, keep it warm for 1 hour, remove the protective film on the surface of 201 austenitic stainless steel and form Fe chloride on the surface of austenitic stainless steel, which is conducive to carburizing; after pretreatment is completed, The low-pressure atmosphere furnace is heated to 485°C for pre-carburizing treatment of 201 austenitic stainless steel, and the carburizing atmosphere is 30%CO+15%H 2 +50%N 2 , Yu CO 2 , the pre-carburization time is 1h, so that th...

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Abstract

The invention provides a surface treatment method for an austenitic stainless steel corrosion-resistant reinforced part, comprising the following steps: 1) pretreatment; 2) pre-carburization treatment; 3) secondary pretreatment; 4) carburization treatment; 5) laser Dynamic focusing; 6) Laser polishing. The surface treatment method of the austenitic stainless steel anti-corrosion reinforced parts is to carry out unconventional gas carburization under the condition of low pressure and medium temperature, and carry out two pretreatments before gas carburization, which is beneficial to the progress of carburization and improves the corrosion resistance of austenitic stainless steel. Hardness; at the same time, its polishing precision is high, which can reach the micro-nano level, and the color is white and bright, which meets the requirements of high precision and color of austenitic stainless steel in the fields of chemical industry and nuclear industry, and expands the application range of austenitic stainless steel.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface treatment, and in particular relates to a surface treatment method for an austenitic stainless steel corrosion-resistant reinforcement. Background technique [0002] Austenitic stainless steel is widely used in chemical industry, automobile, pharmaceutical machinery, electrical components, marine and marine components, decoration and daily necessities, etc. Typical parts are water pumps, gears, pipes, valve seats, etc. Filters, pipe joints, ball valves and other fluid parts in the chemical industry must not only have good corrosion resistance, but also require a certain degree of wear resistance, so as to ensure that they will not become smaller due to wear and tear during repeated use, resulting in workpiece failure or failure. It is long-term corrosion that causes chemical liquids to drip, leak, and run away. Conventional chemical heat treatment, thermal spraying, surface deposi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/22C23C8/02C23C8/80
CPCC23C8/02C23C8/22C23C8/80
Inventor 王建刚王雪辉李朋程英
Owner WUHAN HGLASER ENG CO LTD
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