4.7 Article

Effect of surface finishing on early-stage corrosion of a carbon steel studied by electrochemical and atomic force microscope characterizations

Journal

APPLIED SURFACE SCIENCE
Volume 366, Issue -, Pages 95-103

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.01.081

Keywords

Early-stage corrosion; Surface roughness; Carbon steel; Atomic force microscope; Electrochemical measurements

Funding

  1. Natural Science and Engineering Research Council of Canada (NSERC)

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In this work, the early-stage corrosion of a carbon steel with various surface roughness, which was created by different levels of surface finishing treatment, was characterized by an atomic force microscope and electrochemical measurements. It is found that the resulting surface roughness is at nano-meter scale. As the surface roughness increases, the corrosion activity of the steel is increased. The early-stage corrosion of the steel is featured with two stages of dissolution. While the first stage involves a rapid dissolution and increasing surface roughness of the steel, stage two is in an equilibrium state to have an approximately constant corrosion rate and surface roughness. Generally, the corrosion rate of the steel decreases when the surface finish of the specimen becomes finer. Local preferential corrosion occurs at surface irregularities, resulting in the deepening and widening of the features such as scratches with time. (C) 2016 Elsevier B.V. All rights reserved.

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