Corrosion Behavior of WC-Co and WC-Ni in 3.5% NaCl at Increasing Temperature

Azzura Ismail; Norhaslina Abd Aziz

doi:10.4028/www.scientific.net/AMM.660.135

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 660Corrosion Behavior of WC-Co and WC-Ni in 3.5% NaCl...

Corrosion Behavior of WC-Co and WC-Ni in 3.5% NaCl at Increasing Temperature

Abstract:

Tungsten carbides (WC) are widely used as wear resistant components such as seal, valves, rings, nozzle and bearings. But in some processing operations, the environment necessarily includes severe corrosion or extremes of temperatures. In paper reveal, the corrosion performance of commercial cobalt tungsten carbide (WC-6%Co) and nickel tungsten carbide (WC-9%Ni) in seawater with 3.5% salinity. The experiment was performed in four different temperatures (20°C, 40°C, 60°C and 80°C) and the surface structure by corrosion attack was reveal under SEM. The I_cor_r value of WC-9%Ni is lower than WC-6%Co, elucidate that WC-9%Ni is better in corrosion resistance compare to WC-6%Co. As the temperature increased, the corrosion rate for every material increased as expected. Decreasing in hardness value for both materials reveal that, the material’s hardness decrease after corrosion has attacked.

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Periodical:

Applied Mechanics and Materials (Volume 660)

Pages:

135-139

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.660.135

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Online since:

October 2014

Authors:

Azzura Ismail, Norhaslina Abd Aziz

Keywords:

Corrosion Rate, Salinity, Seawater, WC-6%Co, WC-9%Ni

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