Effects of Direct Current Ice-Melting Technique on Corrosion of Aluminum Conductor Steel Reinforced

The process of direct current (DC) ice-melting on galvanized steel wire was conducted in an environmental chamber using a large direct current generator as power source to study the influence of strong direct current on the corrosion of galvanized steel wire. Combined with the calculation of multi-step network circuit, the influencing factors of corrosion acceleration by large DC ice-melting were investigated. The results show that a significant dissolution of zinc coating occurred on the positive side of the steel wire, while the damage of zinc coating caused by hydrogen evolution was also observed on the negative side of the steel wire. In addition, the corrosion damage concentrating on the positive and negative terminals, led to severe localized corrosion, which easily caused steel wires to break. The calculation results of the multi-stage network circuit model show that the branch current in the ice-melting layer did not increase indefinitely with the extension of the ice-covered line, and the reduction of the polarization resistance of the galvanized steel wire caused the branch current to concentrate on the end of the ice layer, which aggravated localized corrosion.