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Abstract In this paper, we achieved the Co modified aluminide coating on nickel base superalloys by pack cementation process. The corrosion currents ( i corr ) of coated and uncoated… Click to show full abstract
Abstract In this paper, we achieved the Co modified aluminide coating on nickel base superalloys by pack cementation process. The corrosion currents ( i corr ) of coated and uncoated substrate after 1 h of immersion tested by potentiodynamic polarization in 3.5 wt% NaCl solutions are 9.73b × 10 −7 A/cm 2 and 1.31 × 10 −6 A/cm 2 , respectively. With the immersion time extension, the i corr of the coating decreases and the values of |Z| by EIS increase, indicating that the electrochemical reaction rate of the coating becomes slower. The coating presents good corrosion resistance due to the Al 2 O 3 formed on the surface.
Journal Title: Progress in Natural Science: Materials International
Year Published: 2018
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