ABSTRACT

Biofuels, like any high-affinity chemical mixtures; can cause tribological effects at interfaces with metallics (ferrous-nonferrous) and non-metallics due to medium assisted activation of corrosion by unsaturated components. The damages; corrosion and tribological effects on surfaces (abrasive wears and edge/cosmetic corrosion), also include contamination and biofuels replacement due to quality decrease. The most common phenomena include the oxidation of biodiesel which increases its affinity towards metallic counterparts, i.e. automotive parts or processing apparatus, via formation of peroxide compounds by oleic acid, linoleic acid, and linolenic acids. This corrosion receptive medium causes pitting; due to high water content and high electronegativity of dissolved oxygen, and galvanic corrosion; due to high electrical conductivity. The main factors for higher aggressive corrosivity of biofuels can be summarized as high electrical conductivity, polarity, solubility, and hygroscopicity. This paper closely reviews the materials deterioration in contact with biofuels and possible corrosions.

摘要

生物燃料，如任何高亲和力化学混合物；由于不饱和成分对腐蚀的介质辅助活化，可能会在与金属（铁-有色金属）和非金属的界面处引起摩擦学效应。损害赔偿；对表面的腐蚀和摩擦学影响（磨损和边缘/外观腐蚀），还包括由于质量下降而导致的污染和生物燃料更换。最常见的现象包括生物柴油的氧化，其通过油酸、亚油酸和亚麻酸形成过氧化物而增加其对金属对应物（即汽车零件或加工设备）的亲和力。这种腐蚀接受介质会导致点蚀；由于高含水量和高溶解氧电负性，以及电偶腐蚀；由于高导电性。生物燃料具有较高腐蚀性的主要因素可概括为高导电性、极性、溶解性和吸湿性。本文仔细回顾了与生物燃料接触的材料退化和可能的腐蚀。