Corrosive agent for metallographic phase of nickel-saving austenitic stainless steel

A technology of austenitic stainless steel and corrosive agent, applied in the field of corrosive agent, can solve the problems of difficulty in grasping the degree of erosion, coarsening and blurring of grain boundaries, low corrosion efficiency, etc. The effect of high corrosion efficiency

Active Publication Date: 2022-02-15
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a nickel-saving metallographic etchant for austenitic stainless steel. It is difficult to grasp the degree of corrosion in the existing etchant, the corrosion efficiency is not high, or it is easy to be over-corroded, resulting in coarse and blurred grain boundaries and intragranular corrosion. Etching lines appear, which is beneficial to issues such as tissue analysis and grain size evaluation

Method used

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  • Corrosive agent for metallographic phase of nickel-saving austenitic stainless steel
  • Corrosive agent for metallographic phase of nickel-saving austenitic stainless steel
  • Corrosive agent for metallographic phase of nickel-saving austenitic stainless steel

Examples

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Effect test

preparation example Construction

[0035] (1) Preparation of etchant

[0036] The corrosive agent is prepared from 8-12 parts by weight of oxalic acid, 2-4 parts by volume of hydrochloric acid, and 80-120 parts by volume of distilled water, wherein, when the unit of the parts by weight is gram, the unit of the parts by volume is milliliters ; When the unit of the parts by weight is kilogram, the unit of the parts by volume is liter; the consumption of each component can be enlarged or reduced in equal proportion.

[0037] a) Add 8-12 g of oxalic acid into 80-120 ml of distilled water, and keep stirring to mix evenly.

[0038] b) Pour 2-4ml hydrochloric acid into the prepared oxalic acid solution, stir and mix evenly.

[0039] (2) Metallographic corrosion method

[0040] a) The nickel-free austenitic stainless steel sample is made into a metallographic sample by rough grinding, fine grinding, polishing, cleaning and drying.

[0041] b) Take the prepared sample as the anode, fix it with galvanized tweezers and...

specific Embodiment

[0045] The composition of the J3 stainless steel used in the more specific embodiment 1 and embodiment 2 of the present invention is shown in Table 1; the composition of the J5 stainless steel used in Example 3 is shown in Table 2.

[0046] Table 1: Composition of J3 stainless steel used in the test (wt, %)

[0047] C Si mn Cr Ni Cu P S N Fe 0.12 0.40 9.0 13.8 1.31 0.55 0.04 0.004 0.15 margin

[0048] Table 2: Composition of J5 stainless steel used in the test (wt, %)

[0049] C Si mn Cr Ni Cu P S N Fe 0.08 0.47 7.8 15.9 1.22 / 0.04 0.004 0.20 margin

Embodiment 1

[0051] (1) Preparation of corrosive agent

[0052] First add 10g of oxalic acid into a beaker containing 100ml of distilled water, stir evenly, then add 2ml of hydrochloric acid into the prepared oxalic acid solution, stir evenly to prepare a corrosive agent.

[0053] (2) Sample preparation

[0054] Grind and polish the test surface of the J3-section nickel-type austenitic stainless steel cold-rolled sample with 240#, 360#, 600#, 800#, 1000#, and 1200# water-grinding paper in turn after bright annealing to form a sample to be corroded, and then Rinse with distilled water, spray with alcohol and blow dry.

[0055] (3) Corrosion display

[0056] Fix the sample with tweezers and connect it to a DC power supply. The sample is connected to the positive pole, the aluminum plate is connected to the negative pole, the voltage is 20V, and the time is 50s. After the corrosion is over, cut off the power supply, remove the sample, rinse it with distilled water, then spray it with alco...

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Abstract

The embodiment of the present invention provides a nickel-saving metallographic etchant for austenitic stainless steel, the etchant is composed of 8-12 parts by weight of oxalic acid, 2-4 parts by volume of hydrochloric acid, and 80-120 parts by volume of distilled water; When the unit of said parts by weight is gram, the unit of said parts by volume is milliliter; when the unit of said parts by weight is kilogram, the unit of said parts by volume is liter; the consumption ratio of said oxalic acid, hydrochloric acid and distilled water components Expand or shrink.

Description

technical field [0001] The invention belongs to the field of corrosive agents, in particular to a nickel-saving corrosive agent for the metallographic phase of austenitic stainless steel. Background technique [0002] Nickel-saving austenitic stainless steel is a metastable austenitic stainless steel obtained by substituting manganese and nitrogen for nickel in chromium-nickel stainless steel. This series of steel has good strength, plasticity and considerable corrosion resistance, and its corrosion resistance can be comparable to that of 304 stainless steel in general use environments; therefore, it is widely used, mainly used in civil fields such as kitchen, bathroom equipment and appliances and Building decoration and other industries. In the research and application of nickel-saving austenitic stainless steel, in order to ensure a stable austenite structure, it is necessary to analyze its structure, and adjust its composition, rolling and solution treatment process acco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/06C22C38/02C22C38/42C22C38/58G01N1/32
CPCC25F3/06C22C38/02C22C38/58C22C38/42C22C38/002C22C38/001G01N1/32
Inventor 吴海林蒙曰睿廖耀俊庞锐曾垚陈盛淋
Owner LIUZHOU IRON & STEEL
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