含硝硫酸による鉄の腐蝕（第2報）濃厚硫酸溶液中の鉄の腐蝕機構

抄録

Corrosion of iron in 50% sulfuric acid solution shows the same corrosion reaction as in more dilute acid solution. In the acid solution above 60% concentration, corrosion mechanism is different from the one below 50%. Sulfate ions are reduced to sulfite and sulfide ions on the iron surface and the sulfide ions combine with ferrous ions, forming a ferrous sulfide protective film on iron. Developing the corrosion with time, sulfide film is dissolved very slowly and is replaced by ferrous sulfate.