Abstract:
A special brass alloy contained rare earth cerium was prepared by high temperature melting method, and the brass alloy and C7701 alloy were immersed in simulated oil gas field production water, and then Ca
2+ concentration in the production water was measured by EDTA complex formation titration method and the weight loss method. N80 steel sheet was immersed into simulated oil gas field production water with the two alloys treatment for 72 h to calculate the scaling rate on the surface of N80 steel sheet. The microstructure of the scale was observed, and the phase of the scale was analyzed. Anti-scale effect of special brass alloy was studied by combining with the effect of metal cations and galvanic cell action on the scale. The results show that, in the simulated oil and gas field production water, a relatively large amount of Zn
2+ was produced by the special brass alloy, which hindered the nucleation of CaCO
3 crystals; after immersing in simulated oil gas field production water with special brass alloys for 72h, the scaling rate on N80 steel sheet surface decreased by 20%. More calcite calcium carbonate can transform into aragonite calcium carbonate with the special brass alloy's action, so the special brass alloy has a better anti-scale effect than C7701 alloy.