陰極防食用鉛合金陽極の研究 (第6報) 硫酸溶液中の鉛および鉛合金の腐食

抄録

For the purpose of using Pb alloy as an anode in cathodic protection, its corrosion behavior was investigated when soaked in the stagnant sulfuric acid solution without passing current.
The results obtained are as follows:
1) Corrosion rate of electrode can be expressed by sulfation time followed with a sudden change in natural electrode potential.
2) In relatively short period (24 hours), namely within the time just before the sudden change of natural electrode potential, corrosion resistance is decreased as the following order: Pb-Ag, Pb-As, Pb-Sb, Pb.
3) The amount of corrosion loss caused by long-term immersion does not follow the same order as stated above. This seems not due to simple film grown in the early stage of PbSO₄ formation, but to complicated surface covered by PbO and PbSO₄.