Iron corrosion; anti-fouling and anti-corrosive paints . Fig. 27 (magnified).—Thoroughly corroded iron plate ; atmospheric action. The highly energetic action of common salt as a rustformer is evident from Figs. 17 and 19, almost the entiresurface of the iron in both cases being covered with a rela-tively thick crust, requiring but a very short time for itsdevelopment. There occurs both a uniform surface of rust,and individual rust warts ; and in this case also the peculiarphenomenon of a thicker incrustation round the edges thanin the middle is noticeable. 44 IRON-COREOSION AND ANTI-CORROSIVE
Iron corrosion; anti-fouling and anti-corrosive paints . Fig. 27 (magnified).—Thoroughly corroded iron plate ; atmospheric action. The highly energetic action of common salt as a rustformer is evident from Figs. 17 and 19, almost the entiresurface of the iron in both cases being covered with a rela-tively thick crust, requiring but a very short time for itsdevelopment. There occurs both a uniform surface of rust,and individual rust warts ; and in this case also the peculiarphenomenon of a thicker incrustation round the edges thanin the middle is noticeable. 44 IRON-COREOSION AND ANTI-CORROSIVE PAINTS. In all the preceding experiments, wherein the artificialproduction of rust was effected in order to obtain an insightinto the action of the different agencies, scarcely any furtherprogression of the rusting has been observed, owing to thefact that the conditions of such development were lacking,the samples having been stored in a dry place. Only after. Fig. 28 (natural size).—Thick incrustation of rust developed on a wrouglit-iron disc by exposure in the open air. the lapse of months could any alteration of the layers of rustbe detected at all. This extension makes itself evident in various ways. Inall cases where the rust was caused by the action of waterthe increase was scarcely, if at all, appreciable after threemonths storage in paper, this latter material being, as iswell known, an excellent protection against rust. When re-photographed the plates exhibited no alteration and the rust lEON-CORROSION AND ANTI-CORROSIVE PAINTS. 45 i Mii: i m had therefore made no further progress. In the case also ofthe rust produced by salt solution, the photographic picturetaken after three months showed no al-teration. Possibly the superficial crystal-line layer of sodium chloride may havecontributed to this result. The behaviourof the plates treated with hydrochloricacid was, however, different. Here thestorage period of three months, even i
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
