Iron corrosion; anti-fouling and anti-corrosive paints . iflicult 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 u
Iron corrosion; anti-fouling and anti-corrosive paints . iflicult 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 a suitable explanation, theconditions of action of the atmospheric influences havingbeen precisely the same in all cases, , the whole of thetubes, several hundreds in number, were exposed underabsolutely identical circumstances and for exactly the sameperiod of time. The formation of rust under the action of atmosphericinfluences proceeds at a fairly rapid rate, th()Uf:;h not soquickly as when the air is more or less contaminated with. Pig. 17 (natural size).—Rust produced on rolled iron plate by the applicationof a solution of common salt left to dry on. The dark portion to theleft was coated with linseed varnish. smoke fumes, acid vapours, and the like. In such airrusting will take place, even without the access of water—whether as condensed moisture or as rain—at a muchquicker rate than in a purer atmosphere, and its progress isstill further accelerated by moisture, owing to the precipita-tion by the latter, on the metal, of all the injurious vapoursand gases floating about in the air. It is a well-known fact that ironwork in the vicinity of 3 34 IBON-COEEOSION AND ANTI-COEEOSIVE PAINTS. factories employing coal as fuel suiifers greatly from rust,and that in the neighbourhood of chemical works, wheregaseous acids are discharged into the air, all articles madeof cast, wrought, or rolled iron are so rapidly attacked byrust that in a very short time thin
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