Pitting corrosion of stainless steels in chloride solutions
Biljana Bobić
Bore Jegdić
The electrochemical techniques were used for determining the resistance of stainless steels to pitting corrosion in neutral chloride solutions. Cyclic potentiodynamic polarization measurements were performed to determine the pitting potential values in chloride solutions with different amounts of sulphate or nitrate ions. Critical pitting temperature testing was carried out in the same solutions applying potentiostatic technique. Comparison was made between experimentally determined pitting potential and critical pitting temperature values, in chloride solutions containing different amounts of sulphate or nitrate ions. It was established that nitrates are far more effective than sulphates as inhibitors of stainless steels pitting corrosion in neutral chloride solutions.
Key words: stainless steel, corrosion, pitting corrosion, corrosion inhibitors, chlorides, electrochemical methods.