金属由于空气中之氧及水引起了电化学腐蚀,油膜附在金属表面,使金属与空气隔绝,起到一些防护作用,但因油膜的吸水性,透氧性,仍会使金属生锈,为此须针对其特性采取措施. Metal due to oxygen and water in the air caused by electrochemical corrosion, oil film attached to the metal surface, the metal and air isolated, play a protective effect, but the oil film of water absorption, oxygen permeability, will still make the metal rusty, For this purpose, measures must be taken for its characteristics.