Pitting Corrosion Behavior of Sintered SUS444 Stainless Steel in MgCl₂ Solution

Abstract:

The pitting corrosion behavior of sintered SUS 444 stainless steels (P/M specimens) with different kinds of porosity ratios of 13.3, 9.11 and 6.88 % was studied in an aqueous solution containing MgCl2 compared with a conventionally processed SUS 444 stainless steel(I/M specimen). The pitting corrosion potential decreased almost linearly as porosity ratio increased, and the I/M specimen showed the best resistance against the initiation of pitting corrosion. The pitting corrosion morphology by SEM observation showed that more small pits were observed on the specimen with larger porosity ratio while less number but larger diameter pits were observed on the specimen with smaller porosity ratio, and it was also confirmed that the I/M specimen had the least number but the largest and deepest pits.

• Periodical: Materials Science Forum (Volumes 539-543)
• Pages: 3255-3260
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.539-543.3255
• Online since: March 2007
• Authors: Satoshi Sunada, Yusuke Miyazaki, Kazuhiko Majima
• Keywords: Electrochemical Measurement, Local Corrosion, Pitting Corrosion, Pitting Potential, Porosity Ratio, SEM Observation, SUS 444 Steel

References

[1] Stainless Kyokai: Stainless Binran，Nikkan kogyo shinbunshya (1995), 540.

[2] Satoshi Sunada，Kazuhiko Majima，Takeshi Matsuda: Dissolution Behavior of SUS304 Stainless steel due to General Corrosion in H2SO4-NaCl Aqueous Solution, J. Jpn. Soc. Powder Powder Metallurgy, 52(2005), 530-536.

DOI: 10.2497/jjspm.52.530

[3] Satoshi Sunada，Kazuhiko Majima，Syuichi Isida，Koki Kanno，Yoshinobu Takeda: Influence of the Manufacturing Process on Corrosion Resistance of Sintered SUS304 Stainless steel as Mechanical Structural Material, J. Jpn. Soc. Powder Powder Metallurgy, 52(2005).

DOI: 10.2497/jjspm.52.537

[4] Satoshi Sunada，Kazuhiko Majima，Syuichi Isida，Koki Kanno，Yoshinobu Takeda: Influence of the Manufacturing Process on Corrosion Resistance of Sintered SUS304 Stainless steel as Mechanical Structural Material, J. Jpn. Soc. Powder Powder Metallurgy, 52(2005).

DOI: 10.2497/jjspm.52.537

[5] B. Baroux: The Kinetics of Pit Generation, Corrosion Science, 28(1988), 969-986.

DOI: 10.1016/0010-938x(88)90015-7

[6] Roger G. Bate，Bert R. Staples R.A. Robinson: Ionic Hydration and Single Ion Activities in Unassociated Chloride at High Ionic Strengths, Analytical Chemistry, 42(1970), 867-871.

DOI: 10.1021/ac60290a006

[7] Satoshi Sunada，Hidetoshi Maesato, Yoshio Yokoi, Hisakimi Notoya, Sumiko Sanuki, Koich Arai: Effect of Deformation-Induced Martensite on Pitting Corrosion, J. Jpn. Institute of Metal, 54(1990), 1078-1086.