Research on the properties of inside surface of subsurface pump barrel by N–C–O multi-elements penetrating

Subsurface pump usually requires good properties of anti-wear and corrosion resistant because it works in a very bad environment. The performance of the oil-well pump can be distinguishingly improved by intensifying the surface of pump barrel. This paper study the properties of the inside surface of subsurface pump barrel by N–C–O multi-elements penetrating. The modified layer, which is composed of bright layer and transition layer, obtained a thickness of 70 μm at 670 °C, 3 h. The microhardness of the modified layer attains 700 HV. The tribological behavior of the modified layer under dry sliding against steel was evaluated on a ring-on-block test rig. The surface-modified layer showed good friction-reducing and fair anti-wear abilities. Electrochemical corrosion experiment shows that the modified layer further improved the corrosion resistance of pump barrel.