Iron corrosion; anti-fouling and anti-corrosive paints . ust and favour its progressive develop-ment. The author examined an iron pipe which was keptthrough the winter in a perfectly dry place, and found thatthe moisture olstaining access to the room in the course ofdiurnal ventilation, floor cleaning, and respiration, sufficedto develop on the surface, before spring, a fairly uniformrough coating of rust. It is also well known that polishedarticles of steel or iron can be rusted by merely handling IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 35 them once, the thin film thus produced increasing p
Iron corrosion; anti-fouling and anti-corrosive paints . ust and favour its progressive develop-ment. The author examined an iron pipe which was keptthrough the winter in a perfectly dry place, and found thatthe moisture olstaining access to the room in the course ofdiurnal ventilation, floor cleaning, and respiration, sufficedto develop on the surface, before spring, a fairly uniformrough coating of rust. It is also well known that polishedarticles of steel or iron can be rusted by merely handling IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 35 them once, the thin film thus produced increasing pro-gressively as the articles are more frequently used, andfinally forming a dense stratum of rust. That the action of water, acids, common salt in solution,and other rust formers does not produce a uniform effect oniron plate, the author has ascertained by a series of experi-ments. Under identical conditions and on different parts ofthe same piece of metal some places were found spotted withrust, whilst others were free therefrona, without any differ-. PiG. 19 (natural size).—Rust produced by common salt solution on rolled iron plate. ence in the quality of the metal being discernible. More-over, the rust flakes themselves were far from uniform inintensity and shape, so that, here also, much still remainsto be elucidated, and a thorough investigation of the govern-ing conditions is necessary. From the practical point of view the actual cause ofrusting is a matter of indifference, and it is likewise im-material whether carbon dioxide plays any part therein ornot; we know that rust will form on iron, and we also 36 IRON-CORROSION AND ANTI-CORROSIVE PAINTS. know that rust, in whatever form it appears, is a dangerousfoe to the metal. It was once said by a practical man that sooner or laterevery iron bridge must fall into the water, and even if thisstatement is not to be accepted literally, it neverthelessshows a full appreciation of the dangers incurred by ironstructures, especi
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