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Corrosion behaviour of Ni-Co alloy coatings at Kish Island (marine) atmosphere
, Article Bulletin of Materials Science ; Vol. 37, issue. 3 , May , 2014 , p. 713-719 ; Ghorbani, M ; Sharif University of Technology
Abstract
In this study, the corrosion behaviour of Ni-Co alloys with low Co content, electroplated on steel substrate in sulphate bath, was investigated. The morphology of coatings was studied by optical and SEM microscopy. The corrosion products were analyzed using EDX. The results showed that Ni-1%Co coatings had a better corrosion resistance 0.30, 0.92 and 3.75 mpy for atmospheric, salt spray and polarization tests, respectively. These are 0.41, 1.20 and 5.40 mpy for pure nickel coatings that indicate the least corrosion resistance. Surface analysis revealed the presence of oxides, sulphides and chlorides in corrosion products