The Anticorrosive and Antifouling Properties of Ni-W-P-nSiO2 Composite Coating in A Simulated Oilfield Environment

Aiming at the problem of tubing corrosion and scaling in the oilfield environment, the corrosion and scaling behaviour of nickel-tungsten-phosphorus-silica (Ni-W-P-nSiO2) composite coatings prepared on L245 is investigated by immersion test, electrochemical measurement and static scaling test. The results indicated that the corrosion rate of Ni-W-P coating (0.1075 mm a−1) was higher than that of Ni-W-P-nSiO2 coating (0.0552 mm a−1), consistent with the results of corrosion current density (icorr). It was also found that the compact corrosion product film that forms on the Ni-W-P-nSiO2 coating consists of Ni3S2 and FeO. The average scaling rate and calcium loss rate value of the Ni-W-P-nSiO2 coating (2.43 × 10−6  g cm−2 h−1, 0.0344−2 cm−2) were both lower than those of the Ni-W-P coating (1.53 × 10−5 g cm−2 h−1, 0.0542 cm−2), which indicates that SiO2 nanoparticle co-deposition in Ni-W-P coating with the contact angle of 93.71° can improve its antifouling property.