黑膜 meaning in English

belly nape
black film
black membrane

Can adopt wet law or do form of law carry on to supplies ultra to grind , mix or get rid of dark membrane not to change corner while being detailed , a best edge toll polished of surface work
（二）能采用湿法或乾法的形式对物料进行超细研磨、混合或去除黑膜倒角,表面工作件磨光的最佳利器。
A simple and economical oil removal process is introduced . in oil removal equipment , the profiled hinge is prinkled high - efficiency detergent and cleaned mechanically . surface quality of finished profiled hinge is improved with no black carbide films attached after annealing
介绍了简便、经济的除油脱脂方法? ?在机械除油装置中喷淋高效清洗剂，用机械擦试的方法清洗铰链异型材，使成品退火后的异型材无碳化黑膜附着，从而提高其表面质量。
Abstract : a simple and economical oil removal process is introduced . in oil removal equipment , the profiled hinge is prinkled high - efficiency detergent and cleaned mechanically . surface quality of finished profiled hinge is improved with no black carbide films attached after annealing
文摘:介绍了简便、经济的除油脱脂方法? ?在机械除油装置中喷淋高效清洗剂，用机械擦试的方法清洗铰链异型材，使成品退火后的异型材无碳化黑膜附着，从而提高其表面质量。