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Excerpt from The Electrolytic Corrosion of Brasses: Thesis The extensive use of brass for industrial purposes, as pecially in the various parts of hydraulic machinery and boats, makes it very desirable that a scientific study be made of the cor rosive effect of solutions on the brasses. It might be well at the outset to state clearly what we understand by the term corro sion. Brass exposed to the action of climatic changes soon be comes green; silver exposed to smoke blackens, and we commonly say it has tarnished; iron develops a reddish coating, called rust; dissimilar metals in contact in sea-water are rapidly disintegrat ed; iron water-mains in large cities are runied by the corrosive action of stray electric currents. From these few examples, it must be quite clear that all the above changes are chemical, no matter what caused the reaction. Acids act on metals to form salts; this is acid or chemical corrosion. Ah electric current may disintegrate the anodic material; this is electro-chemical corrosion. Are these two forms of corrosion the same? Many decades ago the answer was made in the affirmative, and quite re cently Mr. Turrentine (1) demonstrated experimentally that the dif ferences between the chemical and electro-chemical action of nitric acid on copper are due to dissimilar conditions in the experiments and not to any real differences in the nature of the action. Chemical corrosion of metals by salt solutions is a slow process while the electro-chemical action is rapid. It was therefore the object of this research to study the electro-chemical corrosion phenomena of brasses in aqueous salt solutions, with the purpose. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperf