In the air or chemical corrosion medium corrosion resistant to a high-alloy steel and stainless steel is a beautiful surface and good corrosion resistance, without going through the plated surface treatment, and play inherent in the surface properties of stainless steel, for use in multiple one kind of steel areas, commonly referred to as stainless steel. Representative of the performance of 13 chrome steel, 18-8 chrome-nickel steel alloy.
Mechanism of stainless steel is rust-proof alloy elements form a dense oxide film, cut off from contact with oxygen, to prevent any further oxidation. Therefore, stainless steel is not a "stainless steel." 304. rusting occurs, there may be several reasons: 1. The presence of chloride ions in the environment. Widespread presence of chloride ions, such as salt, sweat, water, wind, soil and so on. Stainless steel in the presence of chloride ions in the environment, the corrosion quickly, even more than ordinary low-carbon steel. 2. without solution treatment. No alloying elements dissolved in the matrix, resulting in tissue matrix alloy content is low, poor corrosion resistance. 3. This material does not contain titanium and niobium have a tendency to intergranular corrosion born. Added titanium and niobium, together with the stabilization process can reduce intergranular corrosion. From the metallographic point of view, because the chromium film formed on the surface of stainless steel contains chromium leaving the thin, the membrane separating invasive oxygen within the steel from corrosion effect. In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% of chromium.
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