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        閃亮不銹鋼,不銹鋼板廠

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        不銹鋼板有哪些主要的化學元素讓它不易不生銹?

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        日期:2019-01-04 瀏覽:
          不銹鋼含有鐵,鉻,錳,硅,碳,并且在許多情況下含有大量的和鉬等化學成分。這些元素與來自水和空氣的氧氣反應形成非常薄的穩定的薄膜,其由諸如金屬氧化物和氫氧化物的腐蝕產物組成。鉻在與氧反應形成該腐蝕產物薄膜中起主導作用。 事實上,根據定義,所有不銹鋼板含有至少10%的鉻。
         
        不銹鋼
         
          不銹鋼由于其合金元素與環境之間的相互作用而保持不銹鋼或不生銹。穩定的薄膜的存在通過充當阻擋氧氣和水進入下面的金屬表面的屏障而防止了額外的腐蝕。因為薄膜形成如此容易和緊密,即使只有少數原子層也將腐蝕速率降低到非常低的水平。如果沒有現代儀器的幫助,薄膜比光的波長薄得多,這一事實很難看出。因此,雖然鋼在原子水平上被腐蝕,但它看起來是不銹鋼。
         
          多年來(大約80年代)人們都知道,向鋼鐵中添加鉻和鎳(鎳不是必需的但鉻是必需的)會使鋼不生銹(就是不銹鋼)。鋼中的鉻形成一層非常薄的氧化物,可防止鐵生銹。類似的機制適用于鋁。當鋁暴露在空氣和水中時,形成薄的,不可見的氧化物涂層,防止進一步腐蝕。生銹是鐵在水存在下被氧化成鐵氧化物和氫氧化物的混合物的過程。
         
        304不锈é’¢板
         
          相反,普通便宜的鋼與來自水的氧反應形成相對不穩定的氧化鐵/氫氧化物膜,其隨著時間的推移而繼續生長并暴露于水和空氣中。因此,這種薄膜,也稱為生銹,達到足夠的厚度,使其在暴露于水和空氣后很快就能觀察到。
         
        總之,不銹鋼不會生銹,因為它具有足夠的活性以通過形成被動腐蝕產品層來保護自身免受進一步的侵蝕。(其他重要的金屬,如鈦和鋁也依賴于鈍化膜的耐腐蝕性。)由于其耐用性和美觀性,不銹鋼被用于各種領域,從餐具到銀行金庫到廚房水槽。
         
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