A Review of Electrochemical Corrosion on Stainless Steel 316

Abstract

Electrochemical corrosion behaviour on stainless steel 316 has been studied with various solutions and its corroded samples along with the microstructural studies and prevention. The electrochemical corrosion occurs due to the transformation of electrons at the metal surface to depolarizer. In the existing approaches, the test methods of the electrochemical corrosion are performed to investigate its behaviour on stainless steel 316. The result shows that small and porous pits were observed when using some acidic solutions (eg: HCl, H2SO4, FeCl3). Localized pitting effect on grain boundries of the corroded sample was analyzed by using an optical microscope and SEM. In PWR (Pressurized Water Reactor) environment, the potentiodynamic polarization test was performed to evaluate the electrochemical behaviour on stainless steel 316. Some results showed that the corrosion rate of stainless steel 316 can be avoided with the help of powder coating methods. Various powder composition such as acrylic, polyester, epoxy, nylon, and urethane can be used to prevent electrochemical corrosion. In this survey, the electrochemical corrosion behaviour on stainless steel 316 was studied and thus, a conclusion is drawn to prevent this electrochemical corrosion by using various powder coating methods.

Keywords

• electrochemical corrosion
• stainless steel 316
• microstructure studies