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一、前言 OCr_(18)Ni_9不锈钢不但具有良好的成型和抛光性能,而且具有良好的抗大气腐蚀和抗人体汗水腐蚀性能,因此常期来被选为表壳材料。 OCr_(18)Ni_9不锈钢之所以耐蚀,是由于其表面在空气中易于钝化,形成了厚度可达20(?)的钝化膜(氧化膜)。这层钝化膜保护着不锈钢在大气中或氧化性介质里免遭腐蚀。但OCr_(18)Ni_9不锈钢在还原性介质里和含有卤素离子的中性介质里是不耐蚀的,如将
First, the preface OCr_ (18) Ni_9 stainless steel not only has good forming and polishing properties, and has good resistance to atmospheric corrosion and anti-corrosive human sweat, it has often been selected as the case material. The reason why OCr_ (18) Ni_9 stainless steel is corrosion-resistant is that its surface is easily passivated in the air to form a passivation film (oxide film) with a thickness of up to 20 μm. This layer of passive film protects stainless steel from corrosion in the atmosphere or in oxidizing media. However, OCr_ (18) Ni_9 stainless steel is not corrosion-resistant in reducing media and in neutral media containing halogen ions,