The alkaline stability of phosphate coatings ICP atomic emission

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The alkaline stability of phosphate coatings I ICP atomic emission spectroelectrochemistry
Inductively coupled plasma (ICP) spectroelectrochemistry was used to measure the alkaline
resistance of zinc phosphate conversion layers on galvanized steel. The release of phosphate,
zinc, manganese and nickel were measured quantitatively as a function of time when exposed
to 0.1 MNaOH at ambient temperature. It was found that phosphate and zinc are removed in
a 1:1 ratio during the early stages of the reaction so as to produce a residual hydroxide layer.
The presence of Mn2t, Fe2t, or Ni2t ions in the phosphate layer reduces the rate of phosphate
leaching proportional to their degree of incorporation in the layer.
2003 Published by Elsevier Ltd.

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