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Distinct Anti‐Corrosion Performance of Q235 Carbon Steel and 316 Stainless Steel from the Perspective of Photoelectrochemical Response
Author(s) -
Qiu Ping,
Li Fei,
Sun Xulu,
Gao Panpan,
Yang Lianjie,
Chen Changfeng,
Ge Lei
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900854
Subject(s) - tafel equation , corrosion , materials science , carbon steel , metallurgy , oxide , chromium , hydroxide , raman spectroscopy , x ray photoelectron spectroscopy , carbon fibers , cathodic protection , anode , composite material , electrochemistry , chemical engineering , electrode , inorganic chemistry , chemistry , physics , composite number , optics , engineering
It is well accepted that stainless steel presents higher corrosion resistance than carbon steel under atmospheric conditions. This study investigates the distinct anti‐corrosion performance between them from the aspect of photoelectrochemical response, which is exposed in simulated atmospheric conditions under visible‐light illumination. The difference on corrosion resistance is evident from the potential shift, the anodic Tafel slope and the charge transfer resistance recorded on the samples under illumination. IR spectroscopy, Raman microspectroscopy and XPS depth profile reveal that the dual layered structure of corrosion products are formed on Q235 carbon steel and 316 stainless steel. The inner corrosion products, which are chromium oxide/hydroxide for stainless steel and magnetite for carbon steel, play a main role in the photo‐generated charges migration behavior.