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Title of Journal: Int J Miner Metall Mater

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Abbravation: International Journal of Minerals, Metallurgy, and Materials

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University of Science and Technology Beijing

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DOI

10.1016/0021-9673(95)00002-5

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ISSN

1869-103X

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Effects of chloride ion concentration and pH value

Authors: Huiyan Li Chaofang Dong Kui Xiao Xiaogang Li Ping Zhong
Publish Date: 2016/11/08
Volume: 23, Issue: 11, Pages: 1286-1293
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Abstract

The effects of Cl− ion concentration and pH values on the corrosion behavior of Cr12Ni3Co12Mo4W ultrahighstrength martensitic stainless steel UHSMSS were investigated by a series of electrochemical tests combined with observations by stereology microscopy and scanning electron microscopy A critical Cl− ion concentration was found to exist approximately 01wt above which pitting occurred The pitting potential decreased with increasing Cl− ion concentration A UHSMSS specimen tempered at 600°C exhibited a better pitting corrosion resistance than the one tempered at 400°C The corrosion current density and passive current density of the UHSMSS tempered at 600°C decreased with increasing pH values of the corrosion solution The pits developed a shallower dish geometry with increasing polarization potential A lacy cover on the pits of the UHSMSS tempered at 400°C accelerated pitting whereas corrosion products deposited in the pits of the UHSMSS tempered at 600°C hindered pitting

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