Funct. Mater. 2023; 30 (2): 217-223.
Research on thiazole corrosion inhibitor with lubricating properties
1Sinopec North China Petroleum Engineering Co., Ltd., Zhengzhou 450000, China
2Drilling Fluid Company, CNPC Western Drilling Engineering Co., Ltd., Chongqing 404100, China
3 Drilling Fluid Technology Service company, CNPC Bohai Drilling Engineering Co., Ltd., Tianjin 300280, China
Corrosion and wear caused the failure of the metal materials in the drilling process. A new type of corrosion inhibition - thiazole corrosion inhibitor with lubricating properties (ZD) prolonging the service life of metal equipment was synthesized and characterized by infrared spectroscopy. The corrosion inhibition and lubrication performance of ZD in 25 wt% KCl solution were investigated by the weight loss method, extreme-pressure lubrication tests, electrochemical measurements and molecular dynamics simulation; the effect of ZD on the corrosion and lubrication properties of drilling fluid was also evaluated via scanning electron microscopy (SEM), four-ball friction tests and so on. Experimental results showed that addition of 3.0 wt% ZD can significantly reduce the corrosion rate of N80 steel in 25 wt% KCl solution and greatly improve lubricating properties. In addition, ZD had little effect on rheological properties and filtration of the saltwater drilling fluid, improved the lubrication properties of drilling fluid and reduced the corrosion reaction of metals, which indicated that ZD was well compatible with drilling fluid. According to theoretical calculations, ZD molecules can spontaneously squeeze away the water molecules adsorbed on the surface of Fe(001), forming a dense organic film to protect the metal.
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