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Abstract
In order to investigate on cathodic protection of steel and stainless steel used for holding sulfuric acid, examination was conducted to check the behavior of pure lead, lead alloys and high-silicon iron in sulfuric acid solution. The experiments were done by measuring the anode potential and analysis of surface film by oxalatimetry.The results obtained are as follows:1) The growth rate of passive film on Pb, Pb-As, etc. follows parabolic law.2) Those on Pb-Te, Pb-Ag, etc. follow the logarithmic law.3) The amount of lead peroxide on Pb-Sn and Pb-Cd electrodes decrease in proportion to the lapse of time.4) Allowable current density for Pb-Ag anode is considered to be approx. 10A/dm2.5) High-silicon iron may be used at the current density of 4A/dm2, while its weight loss caused by corrosion reaches 0.05g/A·hr and is far larger than those of lead alloys examined.
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