Iron corrosion; anti-fouling and anti-corrosive paints . FiG. 23 (natural size).—Rust produced on iron plate through ordinary wearand condensed moisture. graphed ; but, as the result of experiments with variousmethods of illumination of the iron plates here reproduced,it was found possible to obtain all the rust spots as more orless light tones, so that perfectly white spots indicate astrong forixiation of rust, darker tones showing less intenserusting, and the clean metal darkest of all. Another im-portant result, however, sprang from these researches, and 40 IBON-COHEOSION AND ANTI-COEBOSIVB
Iron corrosion; anti-fouling and anti-corrosive paints . FiG. 23 (natural size).—Rust produced on iron plate through ordinary wearand condensed moisture. graphed ; but, as the result of experiments with variousmethods of illumination of the iron plates here reproduced,it was found possible to obtain all the rust spots as more orless light tones, so that perfectly white spots indicate astrong forixiation of rust, darker tones showing less intenserusting, and the clean metal darkest of all. Another im-portant result, however, sprang from these researches, and 40 IBON-COHEOSION AND ANTI-COEBOSIVB PAINTS. that is, that by means of the method of illmnination andreproduction employed it becomes possible to reveal specksof rust undiscernible by the naked eye, or even by the aid ofa hand glass, a circumstance which may find still furtherpractical utilisation. When the forms in which rust makes its appearance areexamined they will be recognised as varying in characterThus, if a drop of water be placed on an iron plate (Fig. 1). Pig. 24 (natural size).- -Rust developed on slieet iron in ordinary use as astove pipe. the rust spot left behind on the evaporation of the watercorresponds in shape and dimensions to those of the colour is a rusty brown-red, with darker patches in-dicating that even in the case of a single drop of water theoxidation is by no means uniform. This is also evidentfrom the variations in the thickness of the rust film, which,mioreover, is interspersed with rust-free specks through whichthe clean surface of the unaltered metal is visible. When lEON-COREOSION AND ANTI-COEEOSIVE PAINTS. 41 magnified (Pig. 2) these rust spots, although so thin, alreadyexhibit signs of flaking off. On leaving a stratum of water on the surface of an ironplate for twelve hours, and then removing the water byevaporation, a stronger development of rust will be found,which—towards the edges of the plate especially—is alreadycomparable to a crust. In this case, peculia
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcorrosionandanticorr
