A STUDY OF THE ROOM TEMPERATURE PHOSPHATE PROCESS
ARMY WEAPONS COMMAND ROCK ISLAND IL RESEARCH DEVELOPMENT AND ENGINEERING DIRECTORATE
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Attempts were made to establish optimum concentration of constituents and operating conditions for the room temperature zinc phosphating process and to attempt to convert the conventional manganese phosphate solution into a room temperature phosphate solution. For the room temperature zinc phosphate process the optimum pH was found to be approximately 4. Good coatings were produced from solutions that were two to three times more concentrated in total acid than the normal operated solution. Moderate addition of nitrite to the room temperature phosphate solution decreased the coating weight of the resultant coating but not the corrosion resistance. A large amount of nitrite decreased the ferrous iron and zinc content. Attempts to convert a conventional manganese phosphate solution into a room temperature phosphating solution was not successful at this time.
- Coatings, Colorants and Finishes
- Properties of Metals and Alloys