Lubricant Carriers for Drawing Alloyed and Unalloyed Steels,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The use of phosphate as a lubricant carrier, and the processes taking place during phosphatization are discussed. The properties of the phosphate layer are given. The formation of oxalate layers is chiefly used for highly-alloyed materials with more than 10 percent Cr. The reaction mechanism for the formation of the oxalate layer is based on the sparing soly. of the bivalent metal oxalate. At present, lime is very much and universally used as lubricant carrier. It is used in the form of a hydrate of the finest particle size, and free from impurities such as SiO2, FeO, Al2O3, and MgO. The difficulties encountered during application, and the disadvantages of this material are given. Another lubricant carrier is water glass. Its concn. and the SiO2Na2O equals 1.8-2.5 must be correctly chosen. An initial concn. of 6-10 g. Na2O is used. On treatment with water glass, unalloyed and alloyed wires are covered with a carrier layer which is deficient in drawing properties and resistance to corrosion. Borax is used for unalloyed, alloyed, and high C steels. It must be dissolved in hot water at 80 degrees. Additives such as wax or Na3PO4 increase the pliability of the layer of lubricant carrier. Addn. of glycerol increases the soly. of the salt.
- Fabrication Metallurgy
- Lubricants and Hydraulic Fluids