연구논문초록(’81-’90) : AISI type 316 Stainless Steel 용접부위에서의 부식특성 = A Study on the Corrosion Properties of AISI type 316 Stainless Steel Weldment

다국어 초록 (Multilingual Abstract)

As a study on the corrosion property change at each part near weldment in AISI type 316 Stainless Steel, causes for the decrease of the corrosion resistance, change of the passive tendency and process of pitting were investigated by metallographic and electrochemical techniques. The equilibrium corrosion potentials, the pitting potentials and the current densities in the passive region in 3% NaCl solution at 19-20℃ were studied with the potentiostatic anodic polarization curves. And the shapes of the pits were investigated as soon as the experiment for anodic polarization curve had been finished(i. e. in the transpassive region).
The followings are the main conclusions drawn from the above experiments. The decrease of corrosion resis-tance is caused by the residual stress as well as the thermal effect.
The passivity decreased at HAZ, and a certain correlation between the passive potential range and the cur-rent density in the passive region was revealed. Pits were most frequently generated at HAZ, and pitting initiated near the grain boundaries.