Iron corrosion; anti-fouling and anti-corrosive paints . it ofsoot, so that in the course of the regular periodical inspectionof the bridge the rust actually present was invisible to theeye. When, however, in the year 1889, the thorough detailedexamination of the Coppinger bridge was undertaken, it wasfound to be so corroded in places as to necessitate immediateextensive repairs. On the removal of the top plates formingthe roadway it became apparent that m niauy places, over the IRON-CORBOSION AND ANTI-COHROSIVE PAINTS. 25 line, the cover plates, angle stays, and wall plates had becomereduced
Iron corrosion; anti-fouling and anti-corrosive paints . it ofsoot, so that in the course of the regular periodical inspectionof the bridge the rust actually present was invisible to theeye. When, however, in the year 1889, the thorough detailedexamination of the Coppinger bridge was undertaken, it wasfound to be so corroded in places as to necessitate immediateextensive repairs. On the removal of the top plates formingthe roadway it became apparent that m niauy places, over the IRON-CORBOSION AND ANTI-COHROSIVE PAINTS. 25 line, the cover plates, angle stays, and wall plates had becomereduced in strength by as much as 50 per cent. ; the anglesof the vertical cross frames and the diagonal plates of thehorizontal projection were in parts no thicker than a knife ;and, in fact, some of these angles were mere stumps. In the Hacker bridge both the longitudinal street girdersand the corrugated (! in.) iron plates were particularlycorroded, the latter being quite eaten through in places. Thedamaged portions still exhibited, in section, the complete. Fig. 8 (natural size).—Rust produced ou rolled iron plate by the action ofconcentrated hydrochloric acid for twenty-four hours. structure of the forged iron, and the smoked surfaces had aglossy 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 posi
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
