Corrosive agent for 9Cr18 high-carbon martensitic stainless steel grain boundary and corrosion method thereof
By using a corrosive agent composed of 49-51 ml of nitric acid solution, 4.5-5.5 ml of hydrochloric acid solution and 14-16 ml of ethanol solution, the problem of difficult to clearly observe the grain boundaries of 9Cr18 high-carbon martensite stainless steel in the prior art is solved, and the effect of clear observation under an optical microscope is achieved. It is easy to operate, easy to obtain reagents, stable corrosion process, and good effect.
Patent Information
- Application Number
- CN202411834735.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-03-21
AI Technical Summary
It is difficult for the prior art to clearly observe the grain boundaries of 9Cr18 high-carbon martensitic stainless steel under an optical microscope, and common corrosive agents have problems such as inconvenient operation, rare reagents, unstable corrosion process, and poor corrosion effect.
The corrosion agent consisting of 49-51 ml of nitric acid solution, 4.5-5.5 ml of hydrochloric acid solution, and 14-16 ml of ethanol solution were used. After mixing them uniformly and letting them stand for 1 hour, the degreasing cotton was used to rub the corrosion on the surface of the sample until the detection surface changed from a bright state to a light gray color.
The grain boundaries of 9Cr18 high-carbon martensitic stainless steel can be clearly observed under an optical microscope. The operation is simple, the reagents are easy to obtain, the corrosion process is stable, and the corrosion effect is good.