Preparation And Application Of Nickel Sulfide Nanoparticles In Protective Coatings In Oil And Gas Pipelines

The paper focuses on the preparation of anti-corrosion coatings with nickel sulfide and copper sulfide nanoparticles and their application oil and gas pipelines.Nickel sulfide(Ni S)nanoparticles were prepared by chemical method using sodium sulfide and nickel chloride as raw materials.Copper sulfide(Cu S)nanoparticles were prepared by hydrothermal method using thiourea and copper nitrate as raw materials.The obtained Ni S and Cu S nanoparticles were characterized by scanning electron microscopy(SEM).The results showed that Ni S nanoparticles with a particle size of about 100 nm and Cu S microspheres assembled with 30 nm nanosheets were successfully prepared.Then,the prepared Ni S and Cu S nanoparticles were respectively used as an anticorrosive coating additive to prepare an epoxy anticorrosive coating.Epoxy coatings containing different amounts of Ni S or Cu S nanoparticles were respectively tested by a dipping method in a hydrogen sulfide solution at 50°C.The performance of the coating was tested by electrochemical impedance spectroscopy.The experimental results showed that the addition of Ni S nanoparticles to the epoxy matrix caused a change in the morphology of the coating.The Ni S nanoparticles also increased the hardness of the composite coating.The coating containing 1%(wt)Ni S nanoparticles exhibited the best corrosion resistance performance,its impedance modulus at 0.01 Hz is close to 1×10¹¹?/cm ².The ability of the coating to resist corrosion of the H2S solution was also significantly improved after the addition of the Cu S microspheres,and the epoxy coating containing 1%(wt)Cu S microspheres had the best anticorrosive effect.