In view of the weaknesses of traditional chromating process such as heterogeneous color and red spots when exposed to the air, two-step-passivating process was adopted using potassium dichromate.

• 由于传统铬酸盐钝化工艺存在钝化膜色泽不均匀及红斑等缺陷,采用二步钝化工艺,消除了传统钝化工艺的缺点。