Corrosion control of galvanized steel using a phosphate/calcium ion inhibitor mixture

The corrosion inhibition of galvanized steel was studied in artificial acid rain solution using extracts of pigments normally used in organic coatings for corrosion control. It was established that a combination of zinc phosphate/molybdate and calcium ion exchange silica has a significant synergetic...

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Bibliographic Details
Published in:Corrosion science 2003-04, Vol.45 (4), p.777-788
Main Authors: Zin, I.M., Lyon, S.B., Pokhmurskii, V.I.
Format: Article
Language:English
Subjects:
Applied sciences
Chromate free
Corrosion
Corrosion prevention
Exact sciences and technology
Inhibitive pigments
Metals. Metallurgy
Organic coated galvanized steel
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Summary:The corrosion inhibition of galvanized steel was studied in artificial acid rain solution using extracts of pigments normally used in organic coatings for corrosion control. It was established that a combination of zinc phosphate/molybdate and calcium ion exchange silica has a significant synergetic anticorrosion effect in the acid rain solution compared to the pigments used alone. Further, the charge transfer resistance of galvanized steel in acid rain solution saturated by the above pigment blend approaches that of strontium chromate in artificial acid rain solution. Use of the pigment blend was found to lead to development of a protective film, which is thought to be a complex mixture of calcium phosphates and zinc phosphate.
ISSN:0010-938X
1879-0496
DOI:10.1016/S0010-938X(02)00130-0