Electrolyte of austenitic stainless steel and application thereof

Abstract

The invention relates to an electrolyte of austenitic stainless steel and application thereof, and relates to the technical field of metallographic detection. The electrolyte is prepared from the following components: chromic acid with the mass percentage concentration of 10 to 40 percent and sodium dodecyl benzene sulfonate with the mass percentage concentration of 4 to 10 percent. The electrolyte does not contain halogen elements and is suitable for nuclear-grade stainless steel equipment and elements, meanwhile, the anionic surfactant is added, so that the electrolyte has a wetting and adsorbing function, chromic acid can fully stay on a to-be-detected surface for corrosion, a good electrolytic corrosion effect is achieved, and a clear structure morphology with layering sense is obtained; not only can the grain boundary be clearly displayed, but also the hierarchical structure morphology can be displayed, and accurate grading of the grain size and observation and analysis of the microscopic structure can be carried out.

Description

technical field [0001] The invention relates to the technical field of metallographic detection, in particular to an electrolyte of austenitic stainless steel and its application. Background technique [0002] On-site metallographic inspection technology is an inspection method that directly conducts metallographic observation or image collection analysis on the surface of equipment and components without sampling. Microstructure observation by microscope, or through on-site image acquisition equipment, or metallographic replica, a detection method for observation and analysis. [0003] Austenitic stainless steel has good mechanical properties, chemical properties, physical properties, radiation properties, process performance and economic performance, and is widely used in nuclear power cladding materials, pipes, valves, partitions and other large structural parts. The service environment of key nuclear power components is extremely harsh, usually in complex environments s...

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Problems solved by technology

The actual usage is: 10% oxalic acid aqueous solution electrolysis can not show the grain boundary and the corrosion effect is difficult to control; 60% nitric acid aqueous solution electrolysis, although it shows the grain boundary, but inhibits the structure morphology, and is a strong oxidizing agent. It is highly corrosive and corrosive strong acid, which will volatilize irritating odor, and it is easy to cause harm to the health of experimenters during use, and it cannot be used without any safety protection on site; it is difficult to control the corrosion of copper sulfate hydrochloric acid aqueous solution. Corrosion time and concentration, a little carelessness will cause the overall corrosion of the sample surface, and the corrosion effect is poor; the ferric chloride hydrochloric acid aqueous solution commonly used in the industry is etched, this method uses a highly corrosive, volatile, irritating In addition, its corrosion effect is not ideal; and the copper sulfate hydrochloric acid aqueous solution and ferric chloride hydrochloric acid aqueous solution contain "chlorine" in the halogen element, which will cause damage to stainless steel materials. The RCC-M standard clearly states that nuclear power key equipment Do not use corrosive agents containing halogen elements for contact

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