Iron corrosion; anti-fouling and anti-corrosive paints . 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, altho
Iron corrosion; anti-fouling and anti-corrosive paints . 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, peculiarly enough, thecentre of the plate (Pig. 3) seems to have remained almostfree from rust, only a few islets having formed. Peehng off. Fig. 25 (natural size).—Sheet of iron perforated by rust; the white patchesare the holes, and the dark lines show the flakes of rust in the act ofpeeling off. is apparent on a more decided scale than in the previousexperiment. By pouring water once over an iron plate so as tothoroughly cover the entire surface (Pigs. 3 to 6) and thenleaving it to dry, only a very shght film of rust is produced,the colour of which is uniform, though a number of spotsare left clean and unrusted. This test results in nothingremarkable and similar effects can be seen daily. The application of concentrated hydrochloric acid, allowedto react during twenty-four hours (Pig. 8), causes the iron to 42 IRON-COEROSION AND ANTI-COEROSIVE PAINTS. dissolve as ferric chloride (Fig. 13). On lightly washing thesolution off with water and leaving the iron to dry in the air,a coating of rust, containing numerous contiguous rusty ex-crescences on a clean-etched sur
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