Research on Improving Throwing Power of Electrodeposition Coating by Optimizing Paint Properties

By increasing the percentage of highly dissociative strong acid components included in the neutralizing acid of the electrodeposition coating, it was possible to improve electrical conductivity and coulomb efficiency and achieve excellent throwing power. The GA cratering caused by the increase in the strong acid ratio was resolved by setting the strong acid ratio to 90% while reducing MEQ. By increasing coulomb efficiency, the quantity of hydrogen gas produced during electrodeposition was minimized, and as a result, gas pinholes remaining in the coating were reduced, increasing the smoothness of the coating beyond than that of the current materials. As a result of this study, the usage of e-coating per vehicle body was reduced by approximately 11%.