Improved corrosion protection for low carbon steel employed for oil tanks: Investigation of wear

Abstract

In this research, by dipping technique, a new glass-ceramic coating on a substrate is applied and developed without prior surface chemical treatment as a single coat. For the low-carbon steel with 0.2% C, various glass frit mixture substrates have been selected at different dispersions and are utilized to acquire a glass-ceramics coating that contains the optimum coating features. The test results also indicated that the mechanical properties (hardness, wear rate) of the resultant coating have been greatly improved by both silicate dispersion supplements into the mixture frit for all cases. On this basis, it is found that the wear rate is less than 3.7134 × 10⁻⁷ g/cm that of the specimens coated with glass-ceramic coating (1.175 ×10⁻⁷ g/cm) and that of the base metal, and the hardness value of the glass-ceramic coating (560 HV) is enhanced greatly to reach (760 HV) at silicate dispersion in 700 °C for 120 min. The electrochemical corrosion test in 3.5% NaCl solution showed higher corrosion resistance for the specimen coated with a glass-ceramic (frit) mixture with zirconium 3.777 × 10  mm/y compared to the uncoated specimen 5.533 × 10 -3  mm/y; the specimen coated with a glass-ceramic (frit) mixture with zirconia by dip coating is the best among all specimens.