Vapour corrosion is reviewed and results on a variety of plastics and a range of metals are presented.Tests have been carried out on some anodic m£!tal coatings on steel: Mnj Se, Cd/ Sn and Znj Ni coatings have been shown to have moderate resistance to corrosion by organic acid vapours. The dangers of hydrogen embrittlement arising from vapour corrosion attack are pointed out.
The equipment and techniques used for determining oxygen in vacuummelted steels, mol$bdenum and single-crystal silicon by vacuum fusion, at levels down to less than 1 p.p.m., are described.The oxygen content of steels at levels of 115 p.p.m. and 6 p.p.m. has been determined with coefficients of variation of 2.3 and 5.2 per cent., respectively. Results on sintered and arc-cast molybdenum with oxygen levels of 42 p.p.m. and 2 p.p.m. showed coefficients of variation of 2 and 8 per cent., respectively.Experiments with zone-refined molybdenum indicated that the oxygen content consisted of a residual surface contamination of 0-8 pg per sq. cm with an internal oxygen content of less than 0.2 p.p.m. With vacuum grown single-crystal silicon a coefficient of variation of 10 per cent. at a level of 17 p.p.m. was obtained on a limited sample weight of 0.5 g.
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