Engineering polyaryl ether coatings bearing phthalazinone moiety resistant to salt spray corrosion

Abstract

Metal corrosion protection is particularly important when marine power systems and exhaust pipes are exposed to high temperatures and salt spray for long periods of time. The key to solving the problem lies in the development of a corrosion resistant coating that is resistant to high temperatures and salt spray. The unique twisted non-coplanar structure of poly(phthalazinone ether nitrile ketone) (PPENK) provides excellent temperature resistance, further improved by adding fillers. The PPENK is used as a resin matrix, combined with inorganic fillers such as silicon carbide, zirconium dioxide and aluminum triphosphate to develop an anticorrosive coating for the surface of steamship in high-temperature environments. This study involved a detailed investigation of the composite coating’s anti-corrosion properties with various formulations, aiming to assess its engineering properties. The results demonstrated that adding silicon carbide and aluminum triphosphate results in a coating with superior abrasion resistance. Notably, aluminum triphosphate significantly enhanced abrasion resistance, regardless of the quantity added. Assessment of temperature and decay resistance was conducted using high-temperature oxidation tests, salt spray tests, and electrochemical impedance spectroscopy, and the resultant coating maintained performance for over 3000 h at 250℃ and offered protection against salt spray for at least 2400 h. Conducting this study on polyaryl ether coatings with phthalazinone structures under high-temperature salt spray conditions establishes a robust basis for protecting maritime operational systems against corrosion, aiming to reduce economic losses and prevent casualties from equipment damage.