Corrosion Behavior of Ni-P Coated Steel Strips
Abstract
In addition to high hardness, Ni-P coatings obtained by the electroless method
are widely used due to their high corrosion resistance. The corrosion resistance
depends on the content of phosphorus in the coating. Various phosphorus contents
result from changes in pH in the process of obtaining layers. The layers obtained in
different working conditions were tested for electrochemical corrosion. Tests were
conducted on a potentiostat PGP 201. There were plotted and analyzed the anodic
polarization Tafel curves for different phosphorus contents, pH conditions and timeexposure
in the coating bath. Analyzing the anodic polarization curves it is noticed
that low phosphorus sample shows an almost continuous corrosion process while
samples with high phosphorus content have slow corrosion in the 3.5% NaCl testing
medium.
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- 2015 fascicula9 nr3 [10]