化学转化膜 钢铁上的黑色氧化膜 规范和试验方法

[中文适用范围]： 本标准规定了钢铁（包括铸铁和锻铁、碳钢、低合金钢和不锈钢）黑色氧化物涂层的要求。 黑色氧化物涂层可用于减少滑动或轴承表面之间的摩擦或用于装饰目的或减少光反射。 此类涂层，无论是否经过补充防腐处理，都可用于需要黑色表面的地方。 即使经过防腐处理，在轻度腐蚀条件下也只能获得非常有限的腐蚀保护。 本国际标准没有规定黑色氧化前基材的状况、光洁度或表面粗糙度的要求。 [外文原描述]： This International Standard specifies requirements for black oxide coatings on iron and steel (including cast and wrought iron, carbon steel, low alloyed steel and stainless steel). Black oxide coatings can be used to diminish friction between sliding or bearing surfaces or for decorative purposes or to reduce light reflection. Such coatings, with or without supplementary preservative treatment, may be used where a black surface is required. Only very limited corrosion protection is obtained under mildly corrosive conditions even with preservative treatment. This International Standard does not specify requirements for the condition, finish or surface roughness of the substrate prior to black oxidizing.