LAUSR

Abstract Copperized oil-coupling exhibits excellent anti-galling performance, but because of the economic and environmental issues, it can't be widely used in practical uses. A new method with good anti-galling performance, lower energy-needed and emission, more simple and inexpensive coupling method for corrosion resistant couplings is urgently needed. A Nano-copper Based Composite Anti-friction Coating (AFRICO), which is the mixing of the high concentration of nano-copper suspension as the basic lubricant with some PTFE nano-particles and a special acrylic resin as a binder is presented here as a feasible alternative new method. The full scale makeup and breakout experiments carried out on the non-API high grade P110S, N80S and TP95TS oil coupling couplings of the AFRICO treated separately showed, that the surfaces of the thread do not appear any obvious galling or scratches. That means the copperized couplings can be replaced by the AFRICO treated couplings in high grade steel corrosion resistant oil-couplings.