Corrosion and cavitation erosion properties of sub-micron WC-Co /Cr3C2-NiCr multi-layered coating on aluminium substrates

Authors

Srinivas VADAPALLI
Umachaitanya PATHEM
Venkata Ramana S N VUPPALA
Kodandarama Rao CHEBATTINA
Jaikumar SAGARI

Publication Date

2020-09-01

Abstract

Marine and automobile components are subjected to corrosion and cavitation erosion during their service. This paper aims to study the use of hard coatings on aluminium substrates with multiple layers of coating comprising of sub-micron sized WC-Co andCr3C2-NiCr for enhancement of hardness, corrosion and cavitation erosion properties. Coatings are applied on aluminium substrates using high-velocity liquid fuel (HVLF) spray technique and the coating parameters are optimized for best results. The results indicate that multiple layered coating with alternate film coatings of Cr3C2-NiCr & submicron WC-Co has significantly improved the hardness of aluminium surface. The resistance to corrosion with multiple layers of coating is found to be exceptional and similar to monolayer Cr3C2-NiCr coating. Cavitation erosion tests performed as per ASTM G32 show that coating with multiple layers could resist the erosion of materials under dynamic conditions. The number of layers in the multiple-layer coatings strongly affects the hardness, corrosion and cavitation erosion properties.

First Page

46

Last Page

54

Recommended Citation

VADAPALLI, Srinivas; PATHEM, Umachaitanya; VUPPALA, Venkata Ramana S N; CHEBATTINA, Kodandarama Rao; and SAGARI, Jaikumar (2020) "Corrosion and cavitation erosion properties of sub-micron WC-Co /Cr3C2-NiCr multi-layered coating on aluminium substrates," Journal of Metals, Materials and Minerals: Vol. 30: No. 3, Article 7.
Available at: https://digital.car.chula.ac.th/jmmm/vol30/iss3/7