Influence of the high temperature treatment of zinc phosphate conversion coatings on the corrosion protection of steel

An anhydrous alpha -Zn sub 3 (PO sub 4 ) sub 2 phase converted by the dehydration of hydrous zinc phosphate, Zn sub 3 (PO sub 4 ) sub 2 x 2H sub 2 O, crystal coatings in air at a temperature of approx 300 deg C, significantly enhances the corrosion resistance of steel Fe--0.06C--0.6Mn--0.6Si, and al...

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Bibliographic Details
Published in:Journal of materials science 1991-02, Vol.26 (4), p.1045-1050
Main Authors: SUGAMA, T, KUKACKA, L. E, CARCIELLO, N, WARREN, J. B
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion prevention
Exact sciences and technology
Metals. Metallurgy
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Summary:An anhydrous alpha -Zn sub 3 (PO sub 4 ) sub 2 phase converted by the dehydration of hydrous zinc phosphate, Zn sub 3 (PO sub 4 ) sub 2 x 2H sub 2 O, crystal coatings in air at a temperature of approx 300 deg C, significantly enhances the corrosion resistance of steel Fe--0.06C--0.6Mn--0.6Si, and also reduces the susceptibility of the crystals to alkalline dissolution. A subsequent alpha - > gamma phase transition at approx 500 deg C results in a poor protection behaviour, because of the formation of numerous microcracks on the crystal faces. Graphs, Photomicrographs, Diffraction patterns. 8 ref.--AA
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00576784