Morphological and microstructural evolutions of manganese phosphate coating formed in Ni²⁺ ion containing electrolyte

Authors: Wang, C.-M.; Tsai, W.-T.; Lee, Y.-P.

Source: Surface Engineering, Volume 24, Number 5, September 2008 , pp. 392-397(6)

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Abstract:

The effect of Ni²⁺ ion in a phosphating solution on the formation of phosphate compound on steel surface is studied. Experimental results indicate that Ni²⁺ promotes the nucleation of the formation of phosphate compound. The number of nucleation sites increases and the particle size decreases as the Ni²⁺ ion concentration in the phosphating solution increases. The presence of Ni²⁺ ions in the coating solution strongly influences the surface morphology and the distributions of Ni, Cr, Mo and V in the phosphate layer. The manganese phosphate coating is a two layered structure which consists of an iron rich inner layer and a Mn rich outer layer. The reduced Ni strips that are located near the centre of the phosphate compound mark the initial substrate surface before phosphating.

Keywords: FILM GROWTH; DEPOSITION MECHANISM; NUCLEATION; MICROSTRUCTURE; MANGANESE PHOSPHATING

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708408X323034

Publication date: 2008-09-01

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