Electrochemical Noise Evaluation on Pitting of 20 Steel in Distillate Solution

The corrosion resistance of 20 steel in distillate solution with different pH values was investigated by electrochemical noise technology.The results indicated that the specimens had different corrosion resistance properties,but showed the same electrochemical noise time spectra and the same corrosion pattern in different solutions.This proves that the electrochemical noise technology can be used to detect the corrosion of carbon steel.Inclusion is the main source of corrosion.The edge between the inclusion and the matrix was corroded and became a pit most easily.