A study of corrosion performance of tinplate with different tin coating thickness in H₂SO₄solution

Abstract

The corrosion performance of tinplate with different coating mass in H2SO4 solution has been investigated by electrochemical measurements and scanning electron microscope observation. The results indicate that the tinplate with a higher tin coating mass exhibits better corrosion resistance than the sample with a lower tin coating mass due to that a lower tin coating mass may not uniformly cover the base steel surface with roughness or other defects. Besides, the amount of coating mass on tinplate can greatly affect its corrosion evolution behavior, and in practical applications the coating mass selection should be selected based on its surrounding corrosive environment. Moreover, the cyclic corrosion process of tinplate in H2SO4 solution can re‐generate H2SO4, and it again accelerates the tinplate dissolution process.

Numerical Simulation for Improving Coating Homogeneity of High-Speed Tin Plating System

“…One of the biggest problems faced by high-speed tin electrodeposition of low tin-coated products is: How to keep the consistent coating uniformity on the tinplate? 4,5 As is known to all, in the electrodeposition process, the existence of the tip effect (also called edge effect) often makes a thicker coating mass at the edge of the product. 6 As early as 1956, the research of Fumio Hine et al showed that when the electrodes were set far away from the wall of the electrolytic cell, the current was obviously concentrated in the cathode edge, and such current distribution would influence the horizontal coating distribution of the tinplate.…”