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如何避免304不銹鋼板生銹

發布時間:2018-05-14

304不銹表面光亮潔凈,具有較強的韌性、塑性,同時又具有耐酸性、堿性氣體以及溶液和其他物質的腐蝕.304不銹一種不容易生銹的不銹鋼,但是并不代表其生銹.不銹鋼的耐腐蝕性取決于不銹鋼內的化學成分以及內部的組織結構,其中不銹鋼的耐腐蝕性起主要作用的是鉻.鉻是一個化學穩定非常高的元素,它能夠在鋼的表面形成一層極其穩定的氧化膜,讓金屬和空氣隔離開來,這樣便保護鋼板不被氧化,增大了鋼板的抗腐蝕性能.
       304不銹鋼板表面質量的好壞,主要決定于熱處理后的酸洗工序,如果前一道熱處理工序所形成的表面氧化皮厚,或組織不均勻,則用酸洗并不能改善表面光潔度和均勻性.所以要充分重視熱處理的加熱或熱處理前的表面清理.如果304不銹鋼板的表面氧化皮厚度不均勻,厚的地方和薄的地方下面的基體金屬表面光潔度也不同,面且酸洗時表面氧化皮的溶解與氧化皮附著部位的基體金屬被酸的侵蝕程度不同,所以,鋼板表面就不均勻.因此,在熱處理加熱時,必須使之均勻地形成氧化皮.要達到這一要求,必須注意以下問題:
       1.304不銹鋼板如果在加熱時工件表面附著油,油附著部位的氧化皮厚度和其他部分的氧化皮厚度和組成就不同,而且會產生滲碳.氧化皮下基體金屬被滲碳的部分將嚴重地受到酸的侵蝕.重油燒嘴最初燃燒時所噴出的油滴,若附著在工件上,影響也很大.操作大員的指紋附著在工件上時也會有影響.所以,澡作大員不要用手直接觸摸不銹鋼件,不要使工件沾上新的油污.必須戴清潔的手套操作.工件表面如有冷加工時附著的潤滑油等,必須在三氯乙烯脫脂劑、苛性鈉溶液中充分脫脂后再用溫水清洗,然后再進行熱處理
        2.304不銹鋼板如果表面有雜物,特別是有機物或灰附著工件上時,加熱當然會對氧化皮有影響.
        3.304不銹鋼板爐內氣氛的差異 爐內氣氛在各局部的不同,氧化皮的形成一也會有變化,這也是造成酸洗后不均勻的原因.所以,在加熱時,爐內各部位的氣氛必須相同.為此,也必須考慮氣氛的循環.

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