Iron corrosion; anti-fouling and anti-corrosive paints . Fig. 12 (magnified).—Rust produced in five minutes on rolled iron plate, withdamaged surface, by dilute hydrochloric acid, washed ofi with water anddried in the warm. It is probably less generally known that gypsum exerts asimilar though slighter effect on iron, manifested more par- IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 29 ticularly when the two materials are employed in positionswhere they are directly exposed to the influence of moisture,or used in rooms filled with very dajiip air. The degree offorce exerted during the expansion w
Iron corrosion; anti-fouling and anti-corrosive paints . Fig. 12 (magnified).—Rust produced in five minutes on rolled iron plate, withdamaged surface, by dilute hydrochloric acid, washed ofi with water anddried in the warm. It is probably less generally known that gypsum exerts asimilar though slighter effect on iron, manifested more par- IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 29 ticularly when the two materials are employed in positionswhere they are directly exposed to the influence of moisture,or used in rooms filled with very dajiip air. The degree offorce exerted during the expansion will be evident from thefollowing instance: In hanging a wooden yard gate threehinge staples were driven into the red sandstone gate postson either side, two of them—the top and Ijottoni staples—being set in lead whilst the middle one was plastered in,probably after the gate had lieen hung. After a time it was. Fig. (natural size).—Rust produi/ed on iron plate by hydrochloric acidand ferric chloride. found that a conchoid fragment of stone was chipping off onthe inner side of one of the posts, without any apparentcause. This fracture left the plastered hinge staple exposedand showed the metal to be in an advanced stage of destruc-tion, scales of rust \ of an inch thick peeling off gypsum also exhibited a characteristic red-brown ap-pearance. As, on inspection, the door was found not to haveexerted any pressure on this middle staple, the only remain-inc explanation possible of the splitting of the otherwise 30 IBON-COREOSION AND ANTI-COREOSIVE PAINTS. perfectly sound and veinless stone was the assumption thatit was caused by the expansion of the metal in rusting. On the other hand, pure cement has proved itself anexcellent preventive of rust, iron set in pure cement re-maining unrusted even when kept under water. Paintingironwork over with a thin gruel of cement also answers
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