In order to compensate the shortcomings of the existing metallographic testing technology and improve the field testing efficiency

a kind of 18 Cr-8 Ni type chemical polishing fluid for metallographic testing of austenitic stainless steel is developed. The polishing fluid is mainly composed of analytical pure hydrochloric acid

analytical pure phosphoric acid and analytical pure hydrofluoric acid. This polishing fluid is then applied in metallographic examination of boiler heating surface tube

the laboratory test and field test results show that

the polishing effect of this chemical polishing fluid is good

the polishing speed is easy to control

and the configuration process is simple

safe and pollution-free

which is not easy to deteriorate

easy to carry

and suitable for metallographic test in the laboratory and production site.