Influences of Concentration and Thickness of MgCl2 Solution Layer on Pit Initiation of Type 304 Stainless Steel in Atmospheric Environment

Hirohata Youhei, Ota Hiroki, Haruna Takumi, Noda Kazuhiko

doi:10.2320/jinstmet.jaw201607

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大気中におけるステンレス鋼の孔食発生に及ぼす MgCl2液膜の濃度および厚さの影響
大気中におけるステンレス鋼の孔食発生に及ぼすMgCl₂液膜の濃度および厚さの影響
タイキチュウニオケルステンレスコウノコウショクハッセイニオヨボス MgCl ₂ エキマクノノウドオヨビアツサノエイキョウ

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Abstract

This paper aimed to investigate conditions for pit initiation on type 304 stainless steel under MgCl₂solution layer in atmospheric environment using a CCD camera system and a surface potential measurement equipment. A droplet of dilute MgCl₂ solution was put on the specimen. The specimen was set in the chamber with a relative humidity of 33% in order to make the droplet dry into the layer. The CCD camera system was employed to observe the change in the shape of the droplet and in the specimen surface during the drying process. In addition, the surface potential measurement equipment was applied for monitoring the surface potential of the specimen with the layer. When the droplet of dilute solution became thin and saturated, pitting corrosion occurred and the surface potential rapidly lowered. By contrast, thick and saturated layer did not induce pitting corrosion and the surface potential indicated the relatively low and steady. Therefore, it was revealed that the atmospheric corrosion occurred on the steel under saturated MgCl₂solution layer whose thickness less than 0.2 mm.

Journal

Journal of the Japan Institute of Metals and Materials

Journal of the Japan Institute of Metals and Materials 81 (3), 115-119, 2017

The Japan Institute of Metals and Materials

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Influences of Concentration and Thickness of MgCl<sub>2</sub> Solution Layer on Pit Initiation of Type 304 Stainless Steel in Atmospheric Environment