Medium chromium base ferrite stainless steel erosion agent and preparing and erosion methods thereof

A technology of stainless steel and ferrite, which is applied in the field of medium chromium-based ferritic stainless steel etchant and its preparation and erosion, can solve the problem of unstable corrosion effect of ferritic stainless steel, lack of ferritic stainless steel corrosion method, and difficulty in effectively Observing low-magnification microstructure and other issues to achieve the effect of clearly visible grains, avoiding intergranular corrosion, and inhibiting intergranular corrosion

Inactive Publication Date: 2017-02-15
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature search found that, in the above-mentioned technical solutions, although the technical solutions of related steel etchants are disclosed, no special etchant has been developed for medium chromium-based ferritic stainless steel. The corrosion method applied to medium chromium-based ferritic stainless steel results in unstable corrosion effect of the etchant on medium chromium-based ferritic stainless steel, and it is difficult to effectively observe the low-magnification structure of medium-chromium-based ferritic stainless steel. problem needs to be solved

Method used

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  • Medium chromium base ferrite stainless steel erosion agent and preparing and erosion methods thereof
  • Medium chromium base ferrite stainless steel erosion agent and preparing and erosion methods thereof
  • Medium chromium base ferrite stainless steel erosion agent and preparing and erosion methods thereof

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Embodiment 1

[0052] Such as figure 1 , figure 2 , image 3 and Figure 4 As shown, a medium-chromium-based ferritic stainless steel etchant of this embodiment is used for the preparation process of the low-magnification solidification structure of medium-chromium-based ferritic stainless steel, and the chromium of medium-chromium-based ferritic stainless steel The content is 16%-18%, and the etching agent is composed of ethanol, nitric acid, hydrochloric acid and distilled water, and the volume ratio of ethanol: nitric acid: hydrochloric acid: distilled water is 1:1:2:2, that is, the volume fraction of each component It is: 50 parts of ethanol, 50 parts of nitric acid, 100 parts of hydrochloric acid, and 100 parts of distilled water. Wherein: ethanol, nitric acid, and hydrochloric acid are all analytically pure, that is, the concentration of ethanol is 95%, the concentration of nitric acid is 65%, and the concentration of hydrochloric acid is 36%.

[0053] In this embodiment, taking m...

Embodiment 2

[0085] The basic content of this embodiment is the same as that of Embodiment 1, except that: the slab of medium chromium-based ferritic stainless steel 439 stainless steel is taken as an example, and the 439 stainless steel is etched, wherein the chromium content is 17.90%. The slab is wide, and its "width x thickness" is "1250 mm x 200 mm". Since the board is wider, the board is divided into three sections, and this embodiment is one of the three sections of the board.

[0086] The etching agent includes: ethanol, nitric acid, hydrochloric acid and distilled water, and the parts by volume of each component are: 25 parts of ethanol, 25 parts of nitric acid, 50 parts of hydrochloric acid, and 50 parts of distilled water.

[0087] An erosion method in the preparation process of a medium-chromium-based ferritic stainless steel low-magnification solidification structure in this embodiment includes the following steps:

[0088] Step 1. Preparation of etchant

[0089] (1) Prepara...

Embodiment 3

[0106] The basic content of this embodiment is the same as that of Example 1, except that the etching agent includes: ethanol, nitric acid, hydrochloric acid and distilled water, and the parts by volume of each component are: 10 parts of ethanol, 20 parts of nitric acid, and 20 parts of hydrochloric acid. 50 parts, 50 parts of distilled water.

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Abstract

The invention discloses a medium chromium base ferrite stainless steel erosion agent and preparing and erosion methods thereof, and belongs to the technical field of medium chromium base ferrite stainless steel tissue erosion observation. The erosion agent comprises, by volume, 10-80 parts of ethyl alcohol, 20-90 parts of nitric acid, 50-100 parts of hydrochloric acid and 50-200 parts of distilled water. The preparing method of the erosion agent includes the steps that the ethyl alcohol and diluent nitric acid are evenly mixed to prepare a nitric acid and ethyl alcohol mixing solution; then the distilled water and the hydrochloric acid are evenly mixed to prepare a hydrochloric acid and distilled water mixing solution; and finally, the nitric acid and ethyl alcohol mixing solution and the hydrochloric acid and distilled water mixing solution are evenly mixed to prepare the erosion agent. According to the creative technical scheme, the effective erosion agent and erosion method are provided for medium chromium base ferrite stainless steel, and therefore technical supports are provided for observation of macrostructures in the medium chromium base ferrite stainless steel.

Description

technical field [0001] The invention relates to the technical field of corrosion observation of ferritic stainless steel structures, and more specifically relates to a medium-chromium-based ferritic stainless steel etchant and a preparation and erosion method thereof. Background technique [0002] Ferritic stainless steel refers to stainless steel that is mainly composed of ferrite in use. In addition to its stainless and general corrosion resistance, it has excellent properties such as chloride stress corrosion resistance, pitting corrosion resistance, and crevice corrosion resistance, and has the characteristics of low cold hardening tendency, high thermal conductivity and low linear expansion coefficient. Among them, medium-chromium-based ferritic stainless steel refers to low-carbon, nickel-free stainless steel, with a chromium content of 16%-18%, and a normal-temperature metallographic structure of ferrite. Medium chromium-based ferritic stainless steel has the followi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 施晓芳常立忠周俐
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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