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齒輪泵技術(shù)
您的當前位置：巴特首頁 > 技術(shù)支持 > 齒輪泵技術(shù) >不銹齒輪鋼泵的耐腐蝕性
來源：巴特計量泵、齒輪泵公司 發(fā)布時間：2013-12-02 17:27:18 瀏覽次數(shù)：次
不銹齒輪鋼泵的耐腐蝕性能一般隨鉻含量的增加而提高,其基本原理是,當鋼中有足夠的鉻時,在鋼的表面形成非常薄的致密的氧化膜,它可以防止進一步的氧化或腐蝕.氧化性的環(huán)境可以強化這種膜,而還原性環(huán)境則必然破壞這種膜,造成鋼的腐蝕.
（1）不銹齒輪鋼泵在各種環(huán)境中的耐腐蝕性能
①大氣腐蝕 不銹鋼耐大氣腐蝕基本上是隨著大氣中的氯化物的含量而變化的.因此,靠近海洋或其他氯化物污染源對不銹鋼的腐蝕是極為重要的.一定量的雨水,只有對鋼表面的氯化物濃度起作用時才是重要的. 農(nóng)村環(huán)境 1Cr13、1 Cr 17和奧氏體型不銹鋼可以適應(yīng)各種用途,其外觀上不會有顯著的改變.因此,在農(nóng)村暴露使用的不銹鋼可以根據(jù)價格,市場供應(yīng)情況,力學(xué)性能、制作加工性能和外觀來選擇. 工業(yè)環(huán)境 在沒有氯化物污染的工業(yè)環(huán)境中,1Cr17和奧氏體型不銹鋼能長期工作,基本上保持無銹蝕,可能在表面形成污膜,但當將污膜清除后,還保持著原有的光亮外觀.在有氯化物的工業(yè)環(huán)境中,將造成不銹鋼銹蝕. 海洋環(huán)境 1Cr13和1 Cr 17不銹鋼在短時期就會形成薄的銹膜,但不會造成明顯的尺寸上的改變.奧氏體型不銹鋼如1 Cr 17Ni7、1 Cr 18Ni9和0 Cr 18Ni9,當暴露于海洋環(huán)境時,可能出現(xiàn)一些銹蝕.銹蝕通常是淺薄的,可以很容易地清除.0 Cr 17 Ni 12M 02含鉬不銹鋼在海洋環(huán)境中基本上是耐腐蝕的. 除了大氣條件外,還有另外兩個影響不銹鋼耐大氣腐蝕性能的因素,即表面狀態(tài)和制作工藝.精加工級別影響不銹鋼在有氯化物的環(huán)境中的耐腐蝕性能.無光表面（毛面）對腐蝕非常敏感,即正常的工業(yè)精加工表面對銹蝕的敏感性較小.表面精加工級別還影響污物和銹蝕的清除.從高精加工的表面上清除污物和銹蝕物很容易,但從無光的表面上清除則很困難.對于無光表面,如果要保持原有的表面狀態(tài)則需要更經(jīng)常的清理.
②淡水 淡水可定義為不分酸性、鹽性或微咸,來源于江河、湖泊、池塘或井中的水. 淡水的腐蝕性受水的pH值、氧含量和成垢傾向性的影響.結(jié)垢（硬）水,其腐蝕性主要由在金屬表面形成垢的數(shù)量和類型來決定.這種垢的形成是存在其中的礦物質(zhì)和溫度的作用.非結(jié)垢（軟）水,這種水一般比硬水的腐蝕性強.可以通過提高pH值或減少含氧量來降低其腐蝕性. 1Cr13不銹鋼明顯地比碳素鋼耐淡水腐蝕,而且在淡水中使用有極好的特征.這種鋼廣泛用于例如需要高強度和耐腐蝕的船塢和水壩等用途.然而,應(yīng)當考慮到在某些情況下,1Cr13在淡水中可能對中度點蝕敏感.但是點蝕完全可以用陰極防腐方法來避免.1Cr17和奧氏體型不銹鋼在室溫（環(huán)境溫度）幾乎完全可以耐淡水腐蝕.
③酸性水 酸性水是指從礦石和煤浸析出的被污染的自然水,由于是較強的酸性所以其腐蝕性比自然淡水強得多.由于水對礦石和煤中所含硫化物的浸析作用,酸性水中通常含有大量的游離硫酸.此外,這種水含有大量的硫酸鐵,對碳鋼的腐蝕有非常大的作用. 受酸性水作用的碳鋼設(shè)備通常很快被腐蝕.用受酸性河水作用的各種材料所做試驗的結(jié)果表明,在這種環(huán)境下奧氏體型不銹鋼有較高的耐腐蝕性能. 奧氏體型不銹鋼在淡水和酸性河水中有極好的耐腐蝕性能,特別是其腐蝕膜對熱傳導(dǎo)的阻礙較小.所以在熱交換用途中廣泛使用不銹鋼管.
④鹽性水 鹽性水的腐蝕特點是經(jīng)常以點蝕的形式出現(xiàn).對于不銹鋼,在很大程度上是由于鹽性水導(dǎo)致起耐腐蝕作用的鈍化膜局部破壞.這些鋼發(fā)生點蝕的其他原因是附著于不銹鋼設(shè)備上的茗荷介和其他海水有機物可形成氧的濃差電池.一旦形成,這些電池非常活躍,并且造成大量腐蝕和點蝕.在鹽性水高速流動的情況下,例如泵的葉輪,奧氏體型不銹鋼的腐蝕通常是非常小的. 對使用不銹鋼管的冷凝器,需保持水流速大于1.5m/s,以使海水有機物和其他固體在管中集聚得少.對處理鹽性水的不銹鋼設(shè)備的結(jié)構(gòu),在設(shè)計時好是減少縫隙和使用厚壁部件.
⑤土壤 埋入土壤中的金屬,取決于天氣和其他因素,處在隨時都在變化的復(fù)雜的狀態(tài)下.實踐證明,奧氏體型不銹鋼一般具有極好的耐大多數(shù)土壤腐蝕的性能,而1Cr13和1Cr17則在很多土壤中要產(chǎn)生點蝕.0 Cr 17Ni12Mо2不銹鋼在所有土壤的試驗中完全可以耐點蝕.
⑥硝酸 含鉻不小于14%的鐵素體型不銹鋼和奧氏體型不銹鋼有極好的耐硝酸腐蝕的性能.1Cr17不銹鋼已廣泛用于硝酸工廠的加工設(shè)備.然而,由于0 Cr 18 Ni 9通常具有較好的成形性能和焊接性能,因此在上述用途中已大量取代了1Cr17不銹鋼. 其他奧氏體型不銹鋼的耐硝酸腐蝕性能與0 Cr 18 Ni 9相近.1Cr17不銹鋼通常比0 Cr 18 Ni 9的腐蝕速率稍高,并且較高的溫度和濃度對其有較大的有害影響. 如果對鋼進行的熱處理不適當,熱硝酸將使奧氏體和鐵素體型不銹鋼產(chǎn)生晶間腐蝕.因此,可用適當?shù)臒崽幚韥眍A(yù)防這種類型的腐蝕,或者使用耐這種類型腐蝕的不銹鋼.
⑦硫酸 標準不銹鋼牌號很少用于硫酸溶液,因為其可使用的范圍很窄.在室溫條件下,0Cr17Ni12Mo2不銹鋼（耐硫酸腐蝕的標準牌號）在硫酸濃度小于15%,或大于85%時是耐腐蝕性的.然而在較高的濃度范圍,通常使用碳鋼.馬氏體和鐵素體型不銹鋼一般不耐硫酸溶液腐蝕. 如同硝酸的情況一樣,如果對不銹鋼不進行適當?shù)臒崽幚?硫酸可造成晶間腐蝕.對于焊接后不能進行熱處理的焊接結(jié)構(gòu),應(yīng)使用低碳牌號00Cr19Ni10或00Cr17Ni14Mo2,或穩(wěn)定化的牌號0Cr18Ni11Ti或0Cr18Ni11Nb不銹鋼.
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