2004•Journal of the Japan Society of Powder and Powder MetallurgyOpen access

Evaluation of Pitting Corrosion Behavior of Sintered SUS444 Stainless Steel in MgCl2 Solution

Satoshi Sunada, Kazuhiko Majima, Yusuke Miyazaki, Takeshi Hasegawa

Abstract

Three kinds of sintered SUS444 stainless steels (P/M stainless steels) whose porosity ratios were 6.9, 9.1 and 13.3 were used in this experiment, and their pitting corrosion behaviors in MgC12 solution were investigated by means of electrochemical measurement and SEM observation compared with normal type SUS444 stainless steel (I/M stainless steel) produced by conventional method. The pitting corrosion resistance of P/M stainless steel decreased with the increasing porosity ratio, and it was lower compared with the I/M stainless steel. The potential of pitting corrosion decreased with an increase in porosity, and the pitting corrosion rate increased as the anodic potential and the porosity ratio increased.

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Key concepts: Materials science, Porosity, Metallurgy, Pitting corrosion, Corrosion, Electrochemistry, Anode, Composite material