Study on Effects of Phosphating Process Parameters on Quality of High Temperature Manganese Phosphating Film
The coupling is an important part of oil casing and oil tube as well as they are connected into tubing string by coupling with the mode of screw joint.In order to improve the anti-galling property of thread of coupling,the high tem-perature manganese phosphating is usually adopted for coupling so that it is corrosion resistant,the friction is reduced and lubrication performance is improved.In this paper,the effects of free acidity,total acidity and acid ratio on the quality of phosphating film and phosphating reaction time are studied by experiments.The phosphating process parameters are further optimized to control the phosphating film weight to be within certain range so that more compact and homogeneous phospha-ting film is obtained.
high temperature manganese phosphatingfree acidtotal acidacid ratiofilm weight
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