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Synopsis:This investigation has been carried out in order to make clear the prot ective nature of rust layers. Measurements have been made of the amount of water-soluble compounds dissolved int o rain-water from rust layer for 1 month, exfoliated rust , retained rust and absorbed SO2 by the rust. The results are summarized as follows:1) Leaching rate of ferrous and sulfate ions into rain -water and exfoliation rate of rust from specimens decreased with increasing the exposure time .

Synopsis L aboralory corrosion lesls and marille eX/Josure lesls were carried oul in order 10 sludy Ihe eJJecls oj alloying elemenls on Ihe corrosion resislance oj low alloy sleel in Ihe s/Jlash zone. nJjecls oj alloying elemenls on Ihe corl'Osioll resislallce were Jound 10 depend U /JOIl Ihe cycle oj drying and welling . [ /I. Ihe relalively dry environmenls, slIch as marine almosphere or II/J/Jer JjJlash zone, addilion oj mallganese, cO/'/Jer, jJhosjJIlOrus, alld chromiulIl illl/Jroved Ihe corrosion resislallce oj sleel. 111 Ihe relalively wei environmenls, such as lou;er splash ZOlle or lidal zone, addilion oj /'/LOsphorus improved Ih e corrosioll resislance considerably, whereas chl'Omium affecled adversely . X -ray diJJraclion oj TIlsl layer Jormed on Ihe sleel specimen revealed Ihat Ihese alloying elemenls aJJecled Ihe corrosion resislance by changing Ihe /Jarticle size q[ magnetile, u-lzicl, u'as Ihe lIIain consliluent oj Ihe rust layer Jortlled in Ihe lIIarine almosphere . T hus, addil ion oj alloying elements Ihat resulled in Ihe rusl layers oj finer magnetite jJarlicles, improved Ihe corl'Osion resislance oj Ihe sleel.

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