Surface modifier for manganese phosphating and preparation method thereof

Abstract

The invention discloses a wear-resistant surface modifier for manganese phosphating and a preparation method thereof. The modifier comprises the following components: 5 to 15wt% of manganese carbonate, 3 to 15wt% of 40% manganous nitrate solution, 1 to 10wt% of disodium hydrogen phosphate, 5 to 15wt% of Na4P2O7, 0.5 to 3wt% of seignette salt, 0.5 to 3wt% of sodium oleate and 0.08 to 0.8wt% of polyvinyl alcohol. The preparation method comprises the following steps: stirring and mixing the measured manganese carbonate, 40% manganous nitrate solution, seignette salt and sodium oleate, adding measured polyvinyl alcohol, carrying out reaction to generate precipitate, drying and grinding the precipitate into powder of 3 to 30 mu m, adding measured Na4P2O7 at weight ratio of (1 to 10): (10 to 1), and completely and uniformly stirring and mixing the mixture.

Description

technical field [0001] The invention relates to a surface regulator for phosphating and a manufacturing method thereof, in particular to a surface regulator for manganese series phosphating with functions of wear resistance and friction reduction and a manufacturing method thereof. Background technique [0002] Iron and steel workpieces generally need to be degreased with strong alkaline working fluid or derusted with acidic working fluid before phosphating treatment. For this reason, the surface of steel workpieces will be corroded by acid and alkali, so that the workpiece will easily form coarse crystals in the phosphating treatment process. The phosphating film layer has poor corrosion resistance. In order to change the surface state of iron and steel workpieces, accelerate the phosphating process, reduce the phosphating temperature, and promote the formation of fine and dense phosphating film layers, surface adjustment agents are usually used for surface adjustment befor...

AI Technical Summary

Problems solved by technology

However, when the existing surface conditioner is used for manganese-based phosphating of large cast iron gears and cast steel gear rings and alloy steel shafts, the following problems will appear to varying degrees: poor suspension, large sedimentation, and poor activity on the surface of the workpiece. Insufficient homogenization ability of active points, resulting in uneven and discontinuous manganese-based phosphating film layer; it must be heated to above 60°C during use, which wastes energy; large amount of use increases production cost; short service life, extreme working fluid easy aging etc.