The degradation of phosphate conversion coatings by electrochemically generated hydroxide
Source abstract
Abstract
The degradation of phosphate coatings by electrochemically generated hydroxide has been investigated for two synthetic conversion coatings on electrogalvanized steel simulating the pH increase occurring during corrosion or cataphoretic painting. The reactivity of the monocation and trication phosphate coating are presented and discussed. By comparing the elemental dissolution rates with the rate of cathodic hydroxide production it is possible to measure the stoichiometry of the degradation reaction: 15 hydroxides per phosphate for monocation and 95 hydroxides per phosphate for trication coatings. These experiments were compared with measurements involving direct exposure to 0.1 M NaOH solution and to multiscan cyclic voltammetry.
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Research context
OpenAlex topics: Corrosion Behavior and Inhibition · Concrete Corrosion and Durability · Hydrogen embrittlement and corrosion behaviors in metals
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References (23)
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