The book The Corrosion And Preservation of Iron And Steel was written by author Allerton Seward Cushman Here you can read free online of The Corrosion And Preservation of Iron And Steel book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Corrosion And Preservation of Iron And Steel a good or bad book?
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Zinc Lead White. — This pigment is made by the reduction of sulphur-bearing ores of lead and zinc, in especially constructed furnaces. Volatilization of the lead and zinc, and subsequent oxidation, takes place, with the formation of a pigment fume consisting of about equal parts of zinc oxide and lead sulphate. The fume is cooled by passage through long metal pipes, and collected in bags. Subsequent treatment for whitening and desulphurization is then made, and the pigment as placed upon the ma...rket is extremely fine in its particle size. 260 CORROSION AND PRESERVATION OF IRON AND STEEL This pigment has a specific gravity of 4.4, and grinds in about 12 per cent, of oil. It is a most excellent pigment for use in tinted paints, but is seldom used alone for white paints, because of a very slight yellowish tint. It has proved of considerable value when mixed with varying percentages of white lead and zinc oxide, and some inert pigments. In its chemical stability it resembles basic sulphate-white lead, and is very well suited for the manufacture of paints containing delicate colors, such as blues and greens.
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