Passivate 鈍化處理

Stainless steels are corrosion-resistant, but they are not completely impervious to rusting. One common mode of corrosion in corrosion-resistant steels is when small spots on the surface begin to rust because grain boundaries or embedded bits of foreign matter (such as grinding swarf) allow water molecules to oxidize some of the iron in those spots despite the alloying chromium. This is called rouging. Some grades of stainless steel are especially resistant to rouging; parts made from them may therefore forgo any passivation step, depending on engineering decisions.

鈍化是使金屬表面轉化為不易氧化的狀態，而延緩金屬的腐蝕速度的方法。另外，一種活性金屬或合金，其化學活性大大降低，而成為貴金屬狀態的現象，也叫鈍化。還有一種工藝，將刀具刃口（銑刀、鑽頭、絲攻...等），做倒圓處理，也叫做鈍化

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