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Effect of Co and W on the corrosion behaviour of 1% Cr steel in flowing synthetic seawater

✍ Scribed by Yoon-Seak Choi; Jae-Joo Shim; Jung-Gu Kim

Publisher: John Wiley and Sons
Year: 2004
Tongue: German
Weight: 273 KB
Volume: 55
Category: Article
ISSN: 0947-5117
DOI: 10.1002/maco.200303725

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✦ Synopsis

Abstract

The aqueous corrosion characteristics of 1% Cr‐steel alloyed with small amounts of Co and W in synthetic seawater was studied by using immersion weight‐loss tests, electrochemical corrosion tests (potentiodynamic tests and electrochemical impedance spectroscopy (EIS) measurements) and analytical techniques. 1% Cr steels containing Co or W from 0.2 to 0.4 wt.% showed higher corrosion resistance than the 1% Cr steel in the immersion and potentiodynamic tests. EIS measurements showed that the Nyquist plot presented one time constant. Furthermore, the Co‐ and W‐bearing steels present higher R~p~ values than the 1% Cr steel through all the test period. The better corrosion resistance of the Co‐and W‐bearing steels is attributed to the protectiveness of the surface layer. The corrosion products were examined using electron probe microanalysis (EPMA) and X‐ray photoelectron spectroscopy (XPS). The results of EPMA indicated that Cr was concentrated in the inner region of the rust layer, while Co and W were distributed all over the rust layer. XPS results showed that Co existed as a trivalent oxide in the rust layer and W in the rust appeared in the form of a WO~4~ compound. These compounds act as a factor for corrosion resistance in aqueous solutions.

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