Iron corrosion; anti-fouling and anti-corrosive paints . black appearance. It therefore seems that not onlyrust formation, but also other and very extensive chemicalchanges had been produced by the constituents of enginesmoke, sulphur dioxide, and so forth. No special investiga-tion was, however, made. In order to protect the renovated bridges from theseinjurious ejecta, a cover plate of galvanised corrugated ironwas placed under the Coppinger bridge in 1890, and the 26 lEON-CORBOSION AND ANTI-COEROSIVB PAINTS. whole of the longitudinal street girders and upper half of thecross girders of the
Iron corrosion; anti-fouling and anti-corrosive paints . black appearance. It therefore seems that not onlyrust formation, but also other and very extensive chemicalchanges had been produced by the constituents of enginesmoke, sulphur dioxide, and so forth. No special investiga-tion was, however, made. In order to protect the renovated bridges from theseinjurious ejecta, a cover plate of galvanised corrugated ironwas placed under the Coppinger bridge in 1890, and the 26 lEON-CORBOSION AND ANTI-COEROSIVB PAINTS. whole of the longitudinal street girders and upper half of thecross girders of the Hacker bridge were encased in concrete,this treatment being pursued on all the street bridges erectedduring the enlarging of the Munich Central Station. Theaforesaid corrugated plates after being in position for threeand a half years were found to be completely eaten throughin places over the sidings, but otherwise had fulfilled theirpurpose, viz., the protection of the actual structure of thebridge. So far as the parts of the ironwork that were coated. Pig. 9 (natural size).—Rust produced on rolled iron plate by the action ofconcentrated hydrochloric acid for twenty-four hours. with concrete are concerned no unfavourable reports have asyet been received. With regard to the action of lime, gyp-sum and cement on ironwork set in fresh masonry, such asgirders, ties, etc., the following particulars are supplied byexperts :— Ironwork embedded in fresh mortar soon becomesattacked to a large extent, and especially portions made ofwrought or rolled iron, cast iron being less susceptible. Thereaction shows itself first in the production of a strong coat- IRON-COHROSION AND ANTI-CORROSIVE PAINTS. 27 ing of rust, which, moreover, is not confined to the surfacealone but quickly extends towards the interior. Thus rustforms, in conjunction with the adjacent particles of mortar,regular scales, which are very brittle and chip off on bendingor exposure to the slightest shock. In addition to
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
