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Dyeing etching agent for displaying phase change martensite structure in S30432 boiler pipe

An etchant and martensite technology, applied in the field of dyeing etchant, can solve the problems that cannot be observed with an optical microscope and affect the mechanical properties and intergranular corrosion properties of S30432 boiler tubes at room temperature, achieving low cost and safe operation Effect

Inactive Publication Date: 2017-11-21
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the room temperature structure of S30432 boiler tubes after high temperature service, a small amount of phase transformation martensite structure often appears in the area close to the grain boundary, which seriously affects the room temperature mechanical properties and intergranular corrosion properties of S30432 boiler tubes. Currently, conventional aqua regia is used After the etchant is etched, it cannot be observed with an optical microscope, but can only be observed with a transmission electron microscope through complex sample preparation

Method used

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  • Dyeing etching agent for displaying phase change martensite structure in S30432 boiler pipe
  • Dyeing etching agent for displaying phase change martensite structure in S30432 boiler pipe
  • Dyeing etching agent for displaying phase change martensite structure in S30432 boiler pipe

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Embodiment 1

[0014] The invention discloses a dyeing etchant for displaying phase transformation martensite structure in S30432 boiler tubes. The etchant is mixed according to the following formula: sodium pyrosulfite: volume concentration 10% hydrochloric acid = 0.25g: 100ml.

Embodiment 2

[0016] The invention discloses a dyeing etchant for displaying phase transformation martensite structure in S30432 boiler tubes. The etchant is mixed according to the following formula: sodium pyrosulfite: volume concentration 10% hydrochloric acid = 0.5g: 100ml.

Embodiment 3

[0018] The invention discloses a dyeing etchant for displaying phase transformation martensite structure in S30432 boiler tubes. The etchant is mixed according to the following formula: sodium pyrosulfite: volume concentration 10% hydrochloric acid = 1.0g: 100ml.

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Abstract

The invention discloses a dyeing etching agent for displaying the phase change martensite structure in a S30432 boiler pipe, wherein the dyeing etching agent is prepared by mixing the following components: sodium metabisulfite A (g) and hydrochloric acid B (mL) with a volume concentration of 10%, and a ratio of A to B is (0.25-1):(90-110). According to the present invention, the new phase-phase change martensite close to the grain boundary zone can be clearly displayed in the S30432 boiler pipe structure etched with the dyeing etching agent of the present invention, and the phase change martensite structure in the sample can be rapidly observed with a light microscope, such that the observation with a transmission electron microscope can be avoided.

Description

technical field [0001] The invention belongs to the technical field of metallographic analysis in iron and steel, and in particular relates to a dyeing etchant for displaying phase transformation martensite structure in S30432 boiler tubes. Background technique [0002] In the room temperature structure of S30432 boiler tubes after high temperature service, a small amount of phase transformation martensite structure often appears in the area close to the grain boundary, which seriously affects the room temperature mechanical properties and intergranular corrosion properties of S30432 boiler tubes. Currently, conventional aqua regia is used After the etchant is etched, it cannot be observed with an optical microscope, but can only be observed with a transmission electron microscope through complex sample preparation. Contents of the invention [0003] The purpose of the present invention is to solve the above technical problems, and provides a dyeing etchant for displaying ...

Claims

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Application Information

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IPC IPC(8): G01N1/30
CPCG01N1/30G01N2001/302
Inventor 史志刚马红贾建明崔雄华
Owner XIAN THERMAL POWER RES INST CO LTD
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