Defects in ion vapor-deposited aluminum coatings on steel exposed to a 0.3 M H3BO4 solution adjusted to pH 8 were detected in situ. The nonaggressive borate solution was chosen to prevent any significant damage to the coating during defect location. The defects were located using a scanning vibrating probe electrode which measured the distribution of current density (CD) above the surface of the coated steel. The vibrating electrode technique enabled polarization measurements of specific areas of the surface to be made. The polarization measurements of the defect sites showed that they were not a result of exposed steel but were caused by the presence of inclusions.

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National Association of Corrosion Engineers
1987
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