Iron corrosion; anti-fouling and anti-corrosive paints . d this againtopped by a coat of red lead paint. From considerations ofeconomy wood is frequently painted over with a coatingof size paint before the oil colour is laid on. Just as in the case of a first coat on iron, the subsequentlayers of paint must only he laid on when tJie surface is jicifectlyfree from water and moisture, and must be equally protected fromwater and rain. The effect of a layer of water upon a per-fectly fresh coat of paint can be seen from Figs. 43 and 44. 92 mON-COREOSION AND ANTI-COEEOSIVB PAINTS. Here the fresh su
Iron corrosion; anti-fouling and anti-corrosive paints . d this againtopped by a coat of red lead paint. From considerations ofeconomy wood is frequently painted over with a coatingof size paint before the oil colour is laid on. Just as in the case of a first coat on iron, the subsequentlayers of paint must only he laid on when tJie surface is jicifectlyfree from water and moisture, and must be equally protected fromwater and rain. The effect of a layer of water upon a per-fectly fresh coat of paint can be seen from Figs. 43 and 44. 92 mON-COREOSION AND ANTI-COEEOSIVB PAINTS. Here the fresh surface of the paint was suffused with water,whereupon a portion of the paint coUected on the surfaceof the water and ran off, whilst the rest remained on theiron, but no longer as a coherent stratum, part of the ironsurface being laid bare. Partial contraction of the paintalso set in. The action of fine rain-drops is illustrated in Figs. 45 and46. The paint was not quite wet, but still far from com-pletely dry, when the drops impinged upon it; and their. Pig. 45 (natural size).—Effect of fine spray on a wet layer ot oil paint. impact partly dispersed the oil colour, thus giving rise toa whole series of depressions, which in the case of horizontalsurfaces would afford a more or less permanent lodgment forthe water, and facilitate its penetration into the layer of paint. Applying the case of iron, as in painting on other surfaces, it isalso necessary to lay the jjaint on as thinly as possible consistentwith covering the object, and on no account should the coating he sothick as to form a wrinkled instead of a smooth surface on the paint be too thick or too thickly laid on—and very thin IRON-CORROSION AND ANTI-COEROSIVE PAINTS. 93 paint is liable to run off altogether when applied to verticalsurfaces—it will spread evenly, in accordance with its naturaltendency, but does not dry in a normal manner. The upperlayer skins over before the underneath parts have
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
