Iron corrosion; anti-fouling and anti-corrosive paints . should be applied? Should not attentionbe directed to preparing a kind of iron that will not rust, atleast under paint ? Furthermore we see in iron structures that, whereveriron chafes against iron, the rust regularly sprouts out. Per-haps this defect also could be obviated in the manufacture. Itis a remarkable thing that a speck of rust will strike througha coat of paint like a smoke stain will through distemper on aceiling. This is most plainly visible when a white paint isused. At first the stain is concealed by the paint, but as 18 I
Iron corrosion; anti-fouling and anti-corrosive paints . should be applied? Should not attentionbe directed to preparing a kind of iron that will not rust, atleast under paint ? Furthermore we see in iron structures that, whereveriron chafes against iron, the rust regularly sprouts out. Per-haps this defect also could be obviated in the manufacture. Itis a remarkable thing that a speck of rust will strike througha coat of paint like a smoke stain will through distemper on aceiling. This is most plainly visible when a white paint isused. At first the stain is concealed by the paint, but as 18 IRON-CORROSION AND ANTI-CORROSIVE PAINTS. this dries it is seen that the rust has turned the paintyellow. Is the oil to blame, by dissolving the rust, or isit due to the small percentage of water present in every oilpaint? The alterations to which iron is subjected in the earthwere shown by a case where two lives were sacrificed throughthe breaking of a gas pipe, the rupture of which was effectedby simple subsidence of the ground. The pipe was found to. Pig. 1 (natural size).—Rust on rolled sheet iron, scoured with pumice; pro-duced by falling drops of water constantly evaporated. have been broken off clean, and exhibited, both externallyand internally, a thick incrustation of rust, the sound coreof metal being not more than %iVT5 inch in thickness. Another peculiar instance of the decomposition of ironwas carefully investigated by Otto Herting. Here an oldiron rail, a T-shaped girder, was found at Cape Breton in amine which had been abandoned for about twenty metal had a specific gravity of only , was greyish-brown in colour, could be cut and shaved with a knife, and IRON-CORROSION AND ANTI-COREOSIVE PAINTS. 19 powdered in a mortar, the powder being magnetic. Analysisfurnished the following interesting result:— Silicon 14-20 Carbon (graphitic) 24-10 Phospliorus ........ 5-85 Sulphur 1-00 Manganese 1-93 Iron 31-50 It is thus evident that the film of iron silic
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