CN105603430A

CN105603430A - Corrosive agent for displaying slip band tissue of shot blasting layer

Info

Publication number: CN105603430A
Application number: CN201610115947.6A
Authority: CN
Inventors: 卢小莉; 李宝虎; 王育翔; 金用强
Original assignee: Shanghai Boiler Works Co Ltd
Current assignee: Shanghai Boiler Works Co Ltd
Priority date: 2016-03-01
Filing date: 2016-03-01
Publication date: 2016-05-25
Anticipated expiration: 2036-03-01
Also published as: CN105603430B

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

A kind of corrosive agent that shows shot-peening layer glide band tissue

Technical field

The present invention relates to a kind of corrosive agent that shows shot-peening layer glide band tissue.

Background technology

Along with improving constantly of Boiler Steam parameter, boiler superheater and the corrosion of reheater steel pipe inner wall steam oxidationBe presented in face of boiler producer and user with the problem of spalling of oxide film plugging, steamed in order to improve tubingVapour problem of oxidation and excavate to greatest extent the potentiality of steel, the companies such as Japanese NKK take the lead in to Super304HAustenic stainless steel inside pipe wall has carried out bead. Evidence bead is to improving the anti-steaming of steel pipe inner wallVapour oxidation susceptibility plays a part positive.

The optics metallurgical feature of shot-peening layer is mainly austenite and a large amount of glide bands of distributing on its matrix.The degree of depth of glide band is relevant with shot peening strength with density, by judging the analysis of glide band feature in tissueThe effect of shot-peening. Conventionally mainly contain iron chloride salt acid solution, sulfuric acid in order to corrode the corrosive agent of austenitic steel matrixThe corrosive agent such as copper solution. But conventional corrosive agent can not clearly demonstrate the glide band of shot-peening layer, impact is slidingThe measurement of the shipper pole degree of depth. Therefore, prepare the corrosive agent of the clear demonstration austenitic steel of a kind of energy shot-peening layer tissue featureParticularly important.

Summary of the invention

Problem to be solved by this invention is to provide a kind of corrosion that can show austenitic stainless steel inner wall shot blasting layerAgent and preparation method thereof.

In order to address the above problem, the invention provides a kind of corrosive agent that shows shot-peening layer glide band tissue, itsBe characterised in that, in every 100mL solution, comprise H₂O35-70mL; Hydrochloric acid 12-35mL; FeCl₃·6H₂O25-55g；CuCl₂·2H₂O1-4g; Nitric acid 4-15mL; Hydrogen peroxide 1-10 drips; And bromogeramine 1-5mL.

The present invention also provides the preparation method of the corrosive agent of above-mentioned demonstration shot-peening layer glide band tissue, and its feature existsIn, first distilled water is added to beaker, then add successively FeCl₃·6H₂O、CuCl₂·2H₂O, is stirred well toFeCl₃·6H₂O and CuCl₂·2H₂O uniform dissolution; Add subsequently hydrochloric acid, stir, then add nitric acidAnd bromogeramine, finally splash into hydrogen peroxide and mix.

The corrosive agent of austenitic stainless steel inner wall shot blasting layer tissue provided by the invention can clearly show OvshinskyThe tissue of body stainless steel shot-peening layer, can be easy to tell the shot-peening layer of inwall under 200 times of light microscopes,And then the degree of depth of shot-peening layer is measured. Under 500 times of light microscopes, can distinguish the fragmentation crystalline substance of shot-peening layerThe form of layer, friendship glide lamella and single glide lamella. Corrosive effect is good.

Brief description of the drawings

Fig. 1 and Fig. 2 are the shot-peening layer tissue under 200 times of light microscopes;

Fig. 3 and Fig. 4 are the shot-peening layer tissue under 500 times of light microscopes.

Detailed description of the invention

For the present invention is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.

The stainless alloying component of TP347H adopting in embodiment is as shown in table 1.

Table 1

C	Mn	Si	S	P	Cr	Ni
							0.07	1.50	0.46	0.002	0.020	19.41	10.09

Embodiment 1

Show a corrosive agent for shot-peening layer glide band tissue, its formula is as shown in table 2.

Table 2

H₂O

Hydrochloric acid

FeCl₃·6H₂O

CuCl₂·2H₂O

Nitric acid

Bromogeramine

Hydrogen peroxide

45mL

50mL

35g

5.5g

19mL

2mL

2

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

Preparation method is as follows:

First distilled water is added to beaker, then add successively FeCl₃·6H₂O，CuCl₂·2H₂O, fully stirsFeCl₃·6H₂O and CuCl₂·2H₂O is to uniform dissolution; Add subsequently hydrochloric acid, stir, then add nitreAcid and bromogeramine, finally splash into hydrogen peroxide and mix.

Test method:

TP347H stainless steel through inner wall shot blasting is processed into metallographic specimen, after grinding and polishing, sample is wipedWipe, about 10s of wiping time, when erosional surface is light grey, water washes out the unnecessary corrosive liquid of specimen surface,Rinse sample with alcohol again, finally dry up sample with hair-dryer, carry out metallographic structure observation with metallographic microscope,As Figure 1-Figure 4. Fig. 1 and Fig. 2 are the shot-peening layer tissues under 200 times of light microscopes, shot-peening layer and baseSoma's difference obviously, can be easy to the degree of depth of shot-peening layer to measure. Fig. 3 and Fig. 4 are optical microphotographsShot-peening layer tissue under 500 times, mirror, from figure, can distinguish shot-peening layer fragmentation crystal layer, hand over glide lamella and single slidingMove the form of layer. Corrosive effect is good.

Embodiment 2-3

Press the same method of embodiment 1, take the formula of table 2, the Austenitic stainless steel pipe of corrosion inner wall shot blasting,The corrosive effect of shot-peening layer is good, the tissue morphology of the clear demonstration shot-peening layer of energy.

Formula and the corrosive effect of table 2 embodiment 1-3

Claims

1. a corrosive agent that shows shot-peening layer glide band tissue, is characterized in that, in every 100mL solution, comprises H₂O35-70mL; Hydrochloric acid 12-35mL; FeCl₃·6H₂O25-55g；CuCl₂·2H₂O1-4g; Nitric acid 4-15mL;Hydrogen peroxide 1-10 drips; And bromogeramine 1-5mL.

2. a preparation method for the corrosive agent of demonstration shot-peening layer glide band tissue claimed in claim 1, its featureBe, first distilled water added to beaker, then add successively FeCl₃·6H₂O、CuCl₂·2H₂O, fully stirsTo FeCl₃·6H₂O and CuCl₂·2H₂O uniform dissolution; Add subsequently hydrochloric acid, stir, then add nitreAcid and bromogeramine, finally splash into hydrogen peroxide and mix.