MAIN PRINCIPLES FOR DEVELOPMENT OF SACRIFICIALANODIC ALLOYS

摘要

Various magnesium, aluminum, and zinc alloys are used worldwide in production ofrnsacrificial anodes for Galvanic Cathodic Protection Systems (CPS). Variations in the inherentrnproperties of many of these anodic materials - usable potential range, current consumptionrnrate, cost, etc. - lead to various application problems and increase the cost of the CPS. In thisrnpaper, the relationship between electrochemical, chemical, and metallurgical properties ofrnalloys (e.g., solvency (α), combination (β), distribution (ω), etc.) is described. The analysis ofrnthese properties allows us to select magnesium, aluminum, and zinc alloy compositions thatrnhave much higher current consumption and exhibit more stable potentials at polarization. Arnline of new magnesium, aluminum, and zinc sacrificial anodic materials (Al-Zn, Zn-Mg, Mg-rnAl, AL-Zn-Mg) has been developed. These materials provide cathodic protection withrnincreased efficiency and service life, and a reduced cost over CPS using traditional anodicrnmaterials.