The rivers run black, the skies are dark gray, the land poisoned by a deadly brew of chemicals and metals.
2
介绍了一种金属钮扣电镀古锡的工艺，其主要工序包括除油、卤化物镀锡、氧化发黑、抛光、罩清漆等。
A process for plating Sn on metal fasteners was introduced, including degreasing, halide Sn plating, oxidative blackening, polishing and varnishing.
3
提出了一种新型黑色金属常温磷化发黑工艺，研究了影响膜层质量的各种因素。
A novel process of ambient temperature parkerizing and blackening for ferrous metals was studied, as also the effect of factors on the finishing quality.
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