The electroless Ni-Mo-P/Ni-P composite coating was applied on N80 carbon steel, and the effects of Mo addition and heat treatment on the corrosion resistance enhancement in CO₂/H₂S/Cl⁻ brine were studied by electrochemical measurements and surface analysis techniques. The Mo addition in the as-deposited Ni-P coating causes the microstructural transformation from amorphous to crystalline due to the reduced P content, thereby suffering severe corrosion. The impaired corrosion performance of as-deposited Mo-incorporated coating is also originated from the absence of the oxide film on the coating surface. Nonetheless, the heat-treated Ni-Mo-P/Ni-P coating exhibits desirable corrosion resistance, which is reflected by the outstanding corrosion inhibition efficiency (η = 96.1%). Heat treatment facilitates the formation of Ni₄Mo phase and more importantly, the growth of an oxide film consisting of nickel and molybdenum oxides (H₂S-immuned MoO₃) with better passivation properties, which accounts for the remarkable corrosion resistance improvement.

非电解镍-钼- P /镍-磷复合涂层施加于N80碳钢，和Mo添加和热处理对CO耐腐蚀性增强的效果₂ / H ₂ S /氯^-通过电化学测量和表面分析技术研究了盐水。沉积的Ni-P涂层中的Mo加入会由于P含量降低而导致从非晶态转变为结晶态，从而导致严重的腐蚀。沉积的掺有Mo的涂层的腐蚀性能受损也源于涂层表面不存在氧化膜。尽管如此，经热处理的Ni-Mo-P / Ni-P涂层仍显示出理想的耐腐蚀性，这由出色的缓蚀效率（η  = 96.1％）反映出来。热处理有助于形成Ni ₄ Mo相，更重要的是，可以促进由镍和钼氧化物（H ₂ S免疫MoO₃）具有更好的钝化性能，这导致显着的耐腐蚀性提高。