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Notes on Factors Affecting Galvanic Corrosion

Notes on Factors Affecting Galvanic Corrosion - FORMS OF...

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1 FORMS OF CORROSION Factors Affecting Galvanic Corrosion There are three factors that are affecting galvanic-corrosion behavior: 1. Area’effects.’This’involves’the’ratio’of’the’surface’area’of’the’more’noble’to’ the’more’active’members.’The’area’ratio’is’unfavourable’ when’the’surface’ area’of’the’more’noble’metal’or’alloy’is’large’in’comparison’to’the’more’ active’member’and’the’galvanic’couple’is’under’cathodic’control.’The’ resulting’polarization’leads’to’increased’corrosion’of’the’active’metal. 2. Effects’of’Distance.’The ’ distance’effect’is’dependent’on’solution’conductivity’ because’the’path’of’current’flow’is’the’primary’consideration.’Dissimilar’ metals’in’a’galvanic’couple’that’are’in’close’physical’proximity’usually’suffer’
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