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A corrosive agent showing the slip zone structure of the shot peening layer

A slip zone and corrosive agent technology, applied in the field of etchant, can solve the problems affecting the measurement of the depth of the slip zone, and cannot clearly show the slip zone of the shot peening layer, etc., and achieve a good corrosion effect

Active Publication Date: 2018-06-29
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional etchant cannot clearly show the slip zone of the shot peening layer, which affects the measurement of the depth of the slip zone

Method used

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  • A corrosive agent showing the slip zone structure of the shot peening layer
  • A corrosive agent showing the slip zone structure of the shot peening layer
  • A corrosive agent showing the slip zone structure of the shot peening layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A corrosive agent showing the slip zone structure of the shot peening layer, the formula of which is shown in Table 2.

[0016] Table 2

[0017] h 2 o

hydrochloric acid

FeCl 3 ·6H 2 o

CuCl 2 2H 2 o

nitric acid

Brogeramine

hydrogen peroxide

45mL

50mL

35g

5.5g

19mL

2mL

2 drops

[0018] Wherein, the mass concentration of hydrochloric acid is 38%, and the mass concentration of nitric acid is 68%.

[0019] The preparation method is as follows:

[0020] Add distilled water to the beaker first, then add FeCl in sequence 3 ·6H 2 O, CuCl 2 2H 2 O, fully stir the FeCl 3 ·6H 2 O and CuCl 2 2H 2 O until uniformly dissolved; then add hydrochloric acid, stir evenly, then add nitric acid and bromogeramine, and finally drop in hydrogen peroxide and mix evenly.

[0021] experiment method:

[0022] Process the TP347H stainless steel that has been shot-peened on the inner wall into a metallographic sam...

Embodiment 2-3

[0024] According to the same method as in Example 1, the formula in Table 2 was used to corrode the austenitic stainless steel pipe with shot peening on the inner wall. The corrosion effect of the shot peening layer was good, and the microstructure of the shot peening layer could be clearly displayed.

[0025] Formulation and corrosion effect of table 2 embodiment 1-3

[0026]

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PUM

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Abstract

The invention discloses a corrosive agent for displaying slip band tissue of a shot blasting layer and a preparing method thereof. Each 100 mL of a corrosive agent solution contains 35-70 mL of H2O, 12-35 mL of hydrochloric acid, 25-55 g of FeCl3.6H2O, 1-4 g of CuCl2.H2O, 4-15 mL of nitric acid, 1-10 drops of hydrogen peroxide and 1-5 mL of bromo-geramine. According to the preparing method, distilled water is added into a beaker, and then FeCl3.6H2O and CuCl2.H2O are sequentially added and fully stirred to be dissolved uniformly; hydrochloric acid is added and stirred uniformly, then nitric acid and bromo-geramine are added, and finally hydrogen peroxide is dripped and mixed uniformly. The corrosive agent for the tissue of the shot blasting layer of the austenitic stainless steel inner wall can clearly display the tissue of the austenitic stainless steel shot blasting layer, and an optical microscope can identify the shot blasting layer of the inner wall easily under 200 folds; the form of a fragmentation layer, a crossing slip layer and a single slip layer of the shot blasting layer can be identified under 500 folds.

Description

technical field [0001] The invention relates to a corrosive agent for displaying the slip zone structure of the shot peening layer. Background technique [0002] With the continuous improvement of boiler steam parameters, the problems of steam oxidation corrosion and oxide film peeling and plugging on the inner wall of boiler superheater and reheater steel pipes have appeared in front of boiler manufacturers and users. In order to improve the problem of steam oxidation of pipes and maximize the To tap the potential of steel, companies such as NKK in Japan took the lead in shot peening the inner wall of Super304H austenitic stainless steel pipe. The test proves that the shot peening treatment plays a positive role in improving the steam oxidation resistance of the inner wall of the steel pipe. [0003] The optical metallographic structure of the shot peening layer is mainly austenite and a large number of slip bands distributed on its matrix. The depth and density of the sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 卢小莉李宝虎王育翔金用强
Owner SHANGHAI BOILER WORKS
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