FUNDAMENTAL STUDY ON ANTI-CORROSION CHARACTERISTICS OF Al-5Mg ALLOY THERMAL SPRAYING COATINGS IN HIGHLY CORROSIVE ENVIRONMENT WITH NaCl

Abstract

 In previous studies, anti-corrosion characteristics of alloy thermal spraying coating has been investigated by various corrosion tests. However, the characteristics of Al-5Mg alloy thermal spraying coating remains largely unknown. In this research, to evaluate the characteristics, accelerated corrosion tests, electro-chemical tests and tensile adhesion tests were conducted. In addition, similar corrosion tests were carried out to compare the characteristics with other coatings by Zn-15Al alloy thermal spraying and C-5 heavy-duty anticorrosive coatings. From these test results, corrosion resistance of Al-5Mg alloy thermal spraying coating is much greater than that of Zn-15Al alloy and C-5 anticorrosive coatings. Al-5Mg alloy coating with a cross-cut has enough anti-corrosion performance against highly corrosive environment with NaCl corresponding to 2,000cycles of cycle-D specified in JIS K 5600-7-9.