The Corrosion of Iron; a Summary of Causes And Preventive Measures
The book The Corrosion of Iron; a Summary of Causes And Preventive Measures was written by author Wilson, L. C Here you can read free online of The Corrosion of Iron; a Summary of Causes And Preventive Measures book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Corrosion of Iron; a Summary of Causes And Preventive Measures a good or bad book?
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Iron does the same thing as the zinc, but much more slowly, so that the copper deposit formed on the zinc is very coarse and easily removed while that on the iron is more or less hard and bright. Putting these together, when a galvanized piece is dipped in copper-sulphate solution, the copper first deposited is easily wiped off, but as soon as the zinc is all gone the copper plates out on the iron, this point being determined by the difference in ap- pearance and behavior of the coating. Prac- ...tically, it is sometimes a little difficult to tell just when all of the zinc is removed; also there are many factors which may work to impair the value of the results obtained, so exact directions have been drawn up cover- PEOTECTIVE MEASURES 59 ing the application of the test and the means by which the critical point may be recognized. Thus there is, ordinarily, a good degree of uniformity in the manner of using it. For ex- ample, the American Steel and Wire Co. di- rects that the copper solution shall be neu- tralized by an excess of pure copper oxide, it shall be filtered before using, and shall have a specific gravity of 1.186 at 65 de- grees F.
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