ミルスケール付着鋼板の腐食挙動

概要

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The corrosion behavior of hot rolled steel plates with mill scale was investigated in conducting the immersion tests and intermittent immersion tests in sea water and tap water, and the following results were obtained. 1) The severer pitting corrosion occurred on the mill scaled specimens immersed in sea water and in the tap water and intermittently immersed in tap water. The severest pitting corrosion found among these mill scaled specimens occurred on the specimens immersed in tap water which is considered to be the most mild in corrosiveness among these tests, and the max. depth of pit was 750μm for the exposure period of 108 days. 2) In the case of intermittent immersion test in sea water, the deeper pits were found on the machined specimens than on the mill scaled specimens. Moreover, the severest corrosion (abt. 2.1mm/108 days) occurred on the bare specimen coupled with mill scaled specimen, where the area ratio of bare one to mill scaled one was 1:630. It is considered that this complicated corrosion behavior of steel plates with mill scale was owing to the interaction among the acceleration of corrosion with mill scale, the increased area of anode by removal of mill scale, the growth of corrosion products and the reduction of corrosion products.
社団法人日本船舶海洋工学会の論文
1990-03-15