Iron corrosion; anti-fouling and anti-corrosive paints . The progressive development of rusting naturally leadsto much more pernicious consequences in the comparativelythin sheet iron than in more massive castings. The former,indeed, when once actually attacked by rust, is entirely cor-roded in a comparatively short space of time, , the rustcontinues to extend and attacks fresh, hitherto sound, por-tions of the metal, which finally is so far permeated therebythat it becomes brittle, falls in holes, and at last crumbles IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 49 away altogether. An advanc
Iron corrosion; anti-fouling and anti-corrosive paints . The progressive development of rusting naturally leadsto much more pernicious consequences in the comparativelythin sheet iron than in more massive castings. The former,indeed, when once actually attacked by rust, is entirely cor-roded in a comparatively short space of time, , the rustcontinues to extend and attacks fresh, hitherto sound, por-tions of the metal, which finally is so far permeated therebythat it becomes brittle, falls in holes, and at last crumbles IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 49 away altogether. An advanced stage of rusting is shown inFig. 23. The rust forms thick layers — removable in theform of rust-brown powder when scraped with a knife—onthe surface of the iron, which still retains some of its strength,though it will break if bent several times in the one laid bare by scraping away the rust show eitherclean metal or rust pittings, the rust has partly gone off-coloured and has become yellowish red, and flakes off inthick PiQ. 35 (magnified).—Rolled sheet iron scoured with pumice and exposed forfive minutes to the action of concentrated hydrochloric acid. The holeshave been eaten away by rust. At a still more advanced stage of rusting, portions of thecorroded plate break away of themselves—as shown in , 25—when touched, and holes are formed. Hence thecohesion of the mass—which, with the exception of a few un-affected patches, now consists entirely of rust—is the present case the rust is nearly black-brown in colour,interspersed with a few light patches, and it appears asthough a few individual fragments of iron are still presentin the mass, these being, however, in a somewhat decom- 50 IRON-COEEOSION AND ANTI-COEROSIVB PAINTS. posed condition. The corrosion of sheet iron to such anextent as to form small, almost imperceptible holes, is almostinvariably due to the action of acids ; corrosion of this kindis mostly encoun
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
