Effects of heat treatment and surface finish on the crevice corrosion resistance of martensitic stainless steel

الملخص EN

The present study aims to investigate the influence of heat treatment and surface finish on the behavior of crevice corrosion resistance of AISI 410 and 416 martensitic stainless steels thus, to quantify the conditions at which crevice corrosion minimize as possible.

The experimental work carried out during this study involves material selection, chemical composition tests, specimens preparation before heat treatments, austenitizing at temperature range (925-1010˚C) and for holding time periods of (30, 45 and 90 min), air and oil quenching followed by tempering at heating range of (205-605 ̊C) and for 45 min, micro hardness tests, specimens grinding, surface roughness measurements, crevice corrosion tests, crevice evaluation and microstructure tests.

Theoretically, empirical equations for crevice maximum depth under the effect of surface roughness and hardness for both AISI 410 and 416 steels were determined.

While for microstructure analysis, carbides average area was determined by using the ImageJ analysis program and a mathematical model was also predicted.

Results showed that, as hardness and surface roughness increase crevice corrosion resistance decreases.

Therefore, material treated by annealing can minimize crevice corrosion rates more than that treated with hardening.