Numerous steel pilings have been used as load-bearing foundations in soils, but there have been few studies on corrosion and corrosion prevention for such pilings. Therefore, tests have been carried out to study on these aspects of problems with special reference to a reclaimed land since a few years ago.
This report includes data relating to the corrosion rate and the effect of cathodic protection of driven test piles, each having a diameter of 165.2mm and a length of 20m.
The results of one-year tests indicated that the corrosion rate was about 0.1mm/yr, the protective current density required was about 15-20mA/m² and the vertical potential distribution of the piles was almost uniform.
The Norwegian Geonor's corrosion sounding apparatus was employed to measure the soil corrosivity. The result of the corrosion sounding was approximately equal to the corrosion rate of the test piles.
Further tests are in progress.

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Some truck relay parts mounted in wooden boxes corroded unusually before use. They were made of nickel-plated brass and corroded in a month of winter. Results of corrosion products analysis showed that these were mainly nickel acetate and a kind of acetate of copper (probably one of basic salts). For the purpose of finding out the source of acetic compounds, several corrosion tests were performed in three kinds of corrosive atmospheres (above vinyl acetate emulsion adhesive, 0.1N acetic acid solution and vinyl acetate monomer). It was suggested, though with many obscurity, that the corrosion was caused by acetic acid from wood and vinyl acetate from adhesive.

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