SYMPOSIA PAPER Published: 27 February 2019

Study on the Repassivation Behavior of Steels Using Electrochemical Test Methods


Passive film stability is very important for the reliable use of many alloys in a given environment. Passive film should also be able to repair or regrow upon damage to provide a reliable protection to alloys. Breakdown and repassivation behavior of passive film plays an important role in localized corrosion of engineering alloys. This paper aims to give a general review of the electrochemical methods used to study the repassivation behavior of alloys and to present two different film removal methods used for repassivation study—namely the scratch test and the electrochemical film-reduction methods. The film reduction method was conducted using carbon steel A569 in borate buffer solution (pH = 8.4) to study the effects of retained plastic strain on the repassivation kinetics of carbon steels. Plastic strain was found to improve the initial repassivation kinetics of carbon steel. The scratch tests were performed on a duplex stainless steel UNS S32003 in both chloride (Cl) and thiosulfate plus chloride (S2O3 2−+ Cl) solutions. Addition of S2O3 2− slows down the repassivation of UNS S32003. Repassivation kinetics of the separated single ferrite phase of UNS S32003 were slower than those of the bulk material.

Author Information

He, Liang
Georgia Institute of Technology, Atlanta, GA, US
Wu, Gaoxiang
Georgia Institute of Technology, Atlanta, GA, US
Singh, Preet, M.
Georgia Institute of Technology, Atlanta, GA, US
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Developed by Committee: G01
Pages: 244–261
DOI: 10.1520/STP160920170229
ISBN-EB: 978-0-8031-7664-5
ISBN-13: 978-0-8031-7663-8