Corrosion inhibition of steel in seawater through surface phosphate formed from oil

To assess the molecule’s effectiveness as an anti-corrosion additive, bis(2-ethylhexyl) phosphate (BEHP) was exposed to carbon steel surfaces from dry and water-saturated dodecane. The resulting changes to the surfaces were characterised using energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), polarised neutron reflectometry (PNR), and far-infrared reflection absorption infrared spectroscopy (far-IR RAIRS). We conclude that, although the BEHP molecules showed no observable affinity to the steel surface in dry solvent, a layer of rough iron (III) phosphate formed in water-saturated dodecane. The phosphate-reacted steel surface was resistant to corrosion by seawater, suggesting the formation of a cohesive barrier against corrosive species. The results support the use of BEHP as an anti-corrosion additive and suggest it is a viable phosphating agent for steel surfaces.

为评估分子作为防腐添加剂的有效性，双（2-乙基己基）磷酸（BEHP）被暴露于干燥和水饱和的十二烷的碳钢表面。通过能量色散X射线光谱（EDX）、X射线光电子能谱（XPS）、偏振中子反射计量（PNR）和远红外反射吸收红外光谱（far-IR RAIRS）对表面的变化进行了表征。我们得出结论，尽管BEHP分子在干燥溶剂中未表现出对钢表面的可观察亲和力，但在水饱和的十二烷中形成了粗糙的铁（III）磷酸层。与磷酸反应的钢表面能够抵抗海水腐蚀，这表明形成了一种对腐蚀物质具有粘附性的屏障。这些结果支持将BEHP用作防腐添加剂，并表明它是一种可行的钢表面磷化剂。