Iron corrosion; anti-fouling and anti-corrosive paints . ion applied to ships during, orshortly after, building never behaves very well, the coatingbecoming loose and gradually peeling off, carrying with it thesuperior layers of pamt. This is to some extent inevitable,owing to the iron having begun to rust while the ship was incourse of construction ; partly, however, it is the result of thedifferent paints used. Tar paint, when fresh, is anti-putrefactive in action, butnecessitates priming with some good composition. The comparatively large number of anti-fouling com- IRON-CORBOSION AND ANTI-
Iron corrosion; anti-fouling and anti-corrosive paints . ion applied to ships during, orshortly after, building never behaves very well, the coatingbecoming loose and gradually peeling off, carrying with it thesuperior layers of pamt. This is to some extent inevitable,owing to the iron having begun to rust while the ship was incourse of construction ; partly, however, it is the result of thedifferent paints used. Tar paint, when fresh, is anti-putrefactive in action, butnecessitates priming with some good composition. The comparatively large number of anti-fouling com- IRON-CORBOSION AND ANTI-CORROSIVE PAINTS. 215 positions in current use may be divided into two classes :the first comprising such as partly prevent the adherenceof testacea, and partly kill these organisms by the activepoisonous constituents present ; whilst to the second belongthose covered by a superior layer of paint, which peels off,and by so doing ensures the removal of the incrustingtestacea. The property of peeling off is often possessed bythe poisonous paints as Fi(.i. 59 (natural size).—Non-peeling anti-fonling composition after threemonths immersion in water. With regard to these compositions, the following obser-vations are made by Holzapfel : The best paints are thepoisonous enamels, which, in addition to possessing toxicproperties, are quick drying, combine with a smooth surface,and do not peel off. To prevent peeling the mass must beapplied to the object in layers, each of which is allowedto dry uniformly, in order to avoid inequality due todissimilar vehicles. Copper salts, especially sulphates oroxides, form new combinations with the surrounding water,and are gradually eaten away, , peel off; and there are 216 mON-CORROSION AND ANTI-COBBOSIVE PAINTS. other materials which also possess dehiscent , himself manufacturer of a widely used composition,lays stress on the suitability of the preparation to the portionof tlie ocean the vessel has to traverse, sin
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
