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Characterization and corrosion behavior of electroless Ni-Mo-P/Ni-P composite coating in CO2/H2S/Cl− brine: Effects of Mo addition and heat treatment
Surface & Coatings Technology ( IF 5.3 ) Pub Date : 2020-09-11 , DOI: 10.1016/j.surfcoat.2020.126416
Jiankuan Li , Chong Sun , Morteza Roostaei , Mahdi Mahmoudi , Vahidoddin Fattahpour , Hongbo Zeng , Jing-Li Luo

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.



中文翻译:

表征和在CO电解镍-钼- P /镍-磷复合涂层的腐蚀行为2 / H 2 S /氯-盐水:添加Mo和热处理的影响

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。

更新日期:2020-09-16
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