Iron corrosion; anti-fouling and anti-corrosive paints . n of rust had proceeded far fromuniformly, although the pipes were all exposed to preciselythe same atmospheric conditions. Many of the pipes hadacquired only a slight film of rust, whilst others were almostfree from rust on the upper side—the one most exposed to therain—though the sides were covered with coherent, but thin,layers of incrustation. Even in one and the same pipe some 32 mON-COBEOSION AND ANTI-CORROSIVE PAINTS. portions were quite free from rust, whilst others, closeto, bore a fairly thick crust. It was in many instanceseas
Iron corrosion; anti-fouling and anti-corrosive paints . n of rust had proceeded far fromuniformly, although the pipes were all exposed to preciselythe same atmospheric conditions. Many of the pipes hadacquired only a slight film of rust, whilst others were almostfree from rust on the upper side—the one most exposed to therain—though the sides were covered with coherent, but thin,layers of incrustation. Even in one and the same pipe some 32 mON-COBEOSION AND ANTI-CORROSIVE PAINTS. portions were quite free from rust, whilst others, closeto, bore a fairly thick crust. It was in many instanceseasy to see where a raindrop had fallen, by the rustypatch, from which a long thin film of rust extended down-wards along the surface of the pipe. The greatest de-velopment of rust was found, on the average, at the endsof the pipes ; and projecting portions of the castings, as wellas cracks and faulty places, were more extensively rustedthan the plain surface. The degree of incrustation wasrelatively greater inside the pipes, indicating that the rust-. Pig. 16 (magnified).—Rust produced by dilute liydrochloric acid on an almostundamaged surface o£ iron plate. The large patch shows where therust has flaked off. forming capacity of moisture is greater than that of water inthe liquid condition. The question why these cast-iron pipesgave such different results under identical conditions ofatmospheric influence seems to be somewhat diflicult toanswer. It may be that the difference is attributable to thematerial itself. That this is the correct solution of theproblem the author will not take upon himself to assert, butone is almost compelled to take this view in order to explainwhy some parts of the metal were free from rust, whilstothers were much corroded. Perhaps the susceptibility torusting is dependent on variations in the rate of cooling, andconsequently in the density, of the castings. The author IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 33 confesses himself unable to find
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
