Reference

Low-temperature parkerizing of parts made from carbon steels

Low-temperature parkerizing of parts made from carbon steels. Kadkevich, O. V. (USSR). Khim. Neft. Mashinostr., (12), 33 (Russian) 1977. CODEN: KHNMAO. DOCUMENT TYPE: Journal CA Section: 55 (Ferrous Metals and Alloys) Low-temp. parkerization was used to obtain protective phosphate coatings on C steel fasteners. The parkerizing soln. contained Mazhef salt [18718-07-5] [Mn(II) phosphate] 60, Zn(NO3)2 60-80, and NaF 3-4 g/L. The temp. of the soln. was 50-60° and dipping time 20 min.

Improved manganese phosphate coatings

Improved manganese phosphate coatings.Some chemicals with cas registry numbers like 14154-09-7 and 18718-07-5 are also used. Crain, Henry (Gen. Thomas J. Rodman lab., Rock Island Arsenal, Rock Island, Ill., USA). U. S. NTIS, AD Rep., AD-A018131, 24 pp. Avail. NTIS From: Gov. Rep. Announce. Index (U. S.) 1976, 76(2), 95 (English) 1975. CODEN: XADRCH. DOCUMENT TYPE: Report CA Section: 56 (Nonferrous Metals and Alloys) The mechanism by which superior Mn phosphate coatings are produced was examd. The phosphate coatings were applied above 212.degree.F and with Mn-org. compds. added to the phosphating soln. The Mn concn. in the bath was critical, and the main function of the Mn-org. compds. was to increase the Mn concn. The necessity of a processing temp. >212.degree.F was attributed to an exponential increase in the reaction rate const. with increasing temp. for the conversion of Mn(H2PO4)2 to Mn3(PO4)2. .