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Effects of inclusions on the resistance to pitting corrosion of S32205 duplex stainless steel
Author(s) -
Zheng Jianchao,
Hu Xiaojun,
Pan Chao,
Fu Shaopeng,
Lin Ping,
Chou Kuochih
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709723
Subject(s) - corrosion , pitting corrosion , materials science , metallurgy , polarization (electrochemistry) , chlorine , duplex (building) , cathodic protection , anode , chemistry , electrode , dna , biochemistry
In order to elucidate the effects of inclusions on the resistance to pitting corrosion of S32205 duplex stainless steel, a potentiodynamic anodic polarization test, a weight loss test, a SEM‐EDS analysis, an in situ analysis and ICP analysis are carried out. The results show that the (Ba, Cr, Si, Ca) oxides and (Mn, Si, Cr, Al) oxides are corroded more easily than (Cr, Mn, Al, Ti) oxides, and the equivalent diameter of the former is greater than that of the latter. The pits of dissolved inclusions act as the initial locations of pitting corrosion in the chlorine ions corrosion environment, which accelerates the corrosion of matrix. The proportion of matrix corrosion is higher than inclusions corrosion in the weight loss.