Titanium and its alloys are active metals, and it is very difficult to get coatings with good adhesion on their surfaces because they are rapidly attacked by oxygen to form an adherent oxide layer.

• 摘要钛及钛合金是非常活泼的金属，由于在其上容易生成一种自然的氧化膜，很难获得结合力良好的镀层。