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Volume :20 Issue : 2 1993      Add To Cart                                                                    Download

Investigation of the effect of pre-exposure to some extraneous ions on the corrosion of copper-nickel alloys in sulfide-polluted artificial seawater

Auther : MAHMOUD R. REDA AND JAMAL N. ALHAJJI

Department of Chemical Engineering, and Department of Mechanical Engineering, University of Kuwait, P.O. Box 5969, Safat 13060, Kuwait

 

ABSTRACT

 

This paper describes the effect of pre-exposing Cu/Ni alloys for two days to various extraneous ions (corrosion inhibitors) on the corrosion rate or this alloy in artificial seawater

polluted with sulfide (1000 ppm), under aerated and stirred conditions. The inhibitors tested were potassium chromate, sodium tungstate, sodium molybdate, sodium metavanadate, sodium nitrite, sodium benzoate, sodium silicate, sodium tetraborate and sodium hexametaphosphate. In order to determine the effect of pre-exposure to these inhibitors on the

susceptibility of Cu/Ni alloy to local attack, potentiodynamic tests were used. It was concluded that potassium chromate and sodium molybdate have a satisfactory potential for protection of 90110 Cu/Ni alloy against both uniform and local corrosion in highly polluted, aerated and stirred synthetic seawater.

 

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