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TWI Industrial Member Report 1165-2023 [pdf / 6331 KB]
By Ben Robinson and Shiladitya Paul
Wear resistant coatings are often used in corrosive environments (eg subsea). While the tribological properties of many of these coatings have been extensively researched, their corrosion properties, particularly in conjunction with industrially relevant substrates, are less established. Although a number of tests have been used to assess material corrosion properties, many of these tests have limited relevance to the final component service environment and are not designed specifically for coated materials, which can differ significantly from single composition bulk materials. This project sought to address the need for more corrosion performance information for wear resistant coatings and to develop a more comprehensive, application focussed, testing approach to assist in future evaluation.
· Wear resistant coatings of TiCN (applied by PVD) and WC (applied by CVD) on nickel Alloy 718 substrates were subject to various corrosion tests in synthetic seawater, including:
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