Metallographic corrosion method for Hastelloy C-276 and 304 stainless steel laser welded joint

A technology of 304 stainless steel and C-276, applied in the field of metallographic corrosion of corrosion-resistant dissimilar alloy welded joints, can solve the problems of poor observation effect, poor corrosion of 304 stainless steel, corrosion of 304 stainless steel, etc. Clear grain boundaries

Inactive Publication Date: 2020-06-09
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The corrosion solution usually used in the chemical etching method of stainless steel is aqua regia. Since the corrosion resistance of Hastelloy C-276 is better than that of 304 stainless steel, the corrosion of 304 stainless steel will always be severely corroded when using aqua regia, while the surface of Hastelloy C-276 Smooth, the observation effect is poor; while the electrolytic corrosion base material 304 stainless steel is not well corroded, and the effect of metallographic observation cannot be achieved

Method used

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  • Metallographic corrosion method for Hastelloy C-276 and 304 stainless steel laser welded joint
  • Metallographic corrosion method for Hastelloy C-276 and 304 stainless steel laser welded joint
  • Metallographic corrosion method for Hastelloy C-276 and 304 stainless steel laser welded joint

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Experimental program
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Effect test

Embodiment 1

[0027] First, at a room temperature of 20-22 °C, use a straw to absorb a small amount of aqua regia solution to corrode the welded joints of the sample, and let the corrosive liquid slowly flow along the surface of the sample to corrode, and the corrosion time is 10s; then rinse with clean water and dry;

[0028] Then at room temperature of 20-22 °C, put the sample into saturated oxalic acid solution to carry out electrolytic corrosion on the welded joint, connect the welded joint of the sample to the anode of the electrolysis device, connect the aluminum alloy electrode to the cathode of the electrolysis device, and set the electrolysis voltage. For 8V, the corrosion time is 20s, then rinse with clean water and dry.

[0029] attached image 3 The metallographic microstructures of Hastelloy C-276 and 304 stainless steel obtained in this example are given by image 3 It can be seen that the grain boundary outline of its structure is clear, image 3 (e) is the metallographic p...

Embodiment 2

[0032] First, at room temperature of 20-22 °C, use a straw to absorb a small amount of aqua regia solution to corrode the welded joints of the sample, and let the corrosive liquid slowly flow along the surface of the sample to corrode, and the corrosion time is 11s; then rinse with water and dry;

[0033] Then at room temperature of 20-22 °C, put the sample into saturated oxalic acid solution to carry out electrolytic corrosion on the welded joint, connect the welded joint of the sample to the anode of the electrolysis device, connect the aluminum alloy electrode to the cathode of the electrolysis device, and set the electrolysis voltage. It is 10V, the corrosion time is 21s, then rinse with clean water and blow dry.

Embodiment 3

[0035] First, at a room temperature of 20-22 °C, use a straw to absorb a small amount of aqua regia solution to corrode the welded joints of the sample, and let the corrosive liquid slowly flow along the surface of the sample to corrode, and the corrosion time is 12s; then rinse with water and dry;

[0036] Then at room temperature of 20-22 °C, put the sample into saturated oxalic acid solution to carry out electrolytic corrosion on the welded joint, connect the welded joint of the sample to the anode of the electrolysis device, connect the aluminum alloy electrode to the cathode of the electrolysis device, and set the electrolysis voltage. For 9V, the corrosion time is 22s, then rinse with clean water and dry.

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Abstract

The invention relates to the technical field of corrosion-resistant dissimilar alloy welded joint metallographic corrosion, in particular to a metallographic corrosion method for a Hastelloy C-276 and304 stainless steel laser welded joint. At the room temperature, a chemical etching and electrolytic etching combined etching method is adopted for metallographic etching of the Hastelloy C-276 and 304 stainless steel laser welded joint, aqua regia solution etching is adopted for the chemical etching method, and a saturated oxalic acid solution is adopted for the electrolytic etching method for electrolytic etching. The problem that the metallographic structure of a single corrosion welded joint is not obvious is effectively solved. Therefore, by using the corrosive agents and the corrosion method, metallographic microstructures of Hastelloy C-276 and 304 stainless steel can be obtained at the same time, the operation method is simple and easy to implement, and the grain boundary outlineof the structure is clear.

Description

technical field [0001] The invention relates to the technical field of metallographic corrosion of corrosion-resistant dissimilar alloy welding joints, and provides a metallographic corrosion method for laser welding joints of C-276 Hastelloy and 304 stainless steel. Background technique [0002] Hastelloy C-276 is an alloy with good corrosion resistance, which is often used in important fields such as chemical industry, nuclear power plant, and aviation industry. Due to its high price, under the premise of meeting the requirements of use, in order to save costs, it is often necessary to weld it with other materials for use. The most common is to weld Hastelloy C-276 and 304 stainless steel. Due to the different alloy composition in the metal, the structure is also slightly different, resulting in different corrosion properties. In the process of metallographic corrosion, the corrosion of 304 stainless steel is often severe or the corrosion of C-276 alloy is too light, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 徐德生王颖赵小辉余浩轩赵才宇金歌
Owner JILIN UNIV
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