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    釩腐蝕試驗方法



    (1)腐蝕的實驗室加速試驗方法

    關于釩腐蝕的實驗室加速試驗方法,主要有合成灰涂敷試驗、合成灰浸泡試驗、杯型試驗、交替浸泡試驗、浸泡斷裂試驗、氧消耗量測定試驗、電化學試驗等方法。但以上試驗方法均不能很好地重現實際情況,一般只能用于材料的相互比較。最終的評價還得在實際裝置

    二進行試驗。

    ①合成灰涂敷試驗:該法是先設定重油燃燒時所生成的灰分的成分,然后將V2O5用水和丙酮之類的有機試劑進行調合,把混合物涂敷在試樣上,用電爐進行高溫加熱。也可以再混人Mo()3Bi203,W03Na2SO4等物質進行試驗。加熱一般在大氣中進行,但也有的在氧氣中或空氣+水蒸氣+S+02的介質中進行。最后根據質量法來評價材料的耐蝕性。

    ②合成灰埋置試驗:該法是將試樣放在二氧化硅制的柑渦中,加人叭仇或V2+

    Na2SO4的混合灰,然后在高溫下加熱。試樣可全埋或半埋,對于后者可以看到試樣界面區的劇烈腐蝕。耐蝕性可用去除氧化皮后的質量損失或試樣厚度的減少及外觀變化等方法來評價。去除氧化皮的溶液有HCI+HF,HN03+Hh'、熔融苛性鈉、NaOH+I%KMnO4溶液等。

    ③杯型試驗:該法是將試驗材料加工成杯型試樣,杯中放人合成灰,然后在高溫下進行加熱。杯型試樣可設計成各種形狀。合成灰的成分有V205V205+Na2SO4等。試驗溫度在650843℃范圍內。杯型試樣去除氧化皮后,測定其侵蝕深度或質量變化,以評價其耐蝕性。同時還可用顯微鏡進行觀察。

    ④交替浸泡加熱試驗:考慮到試樣浸泡在熔融合成灰中的狀態與實際條件不同,所以將浸泡和大氣加熱交替進行,這就是交替浸泡加熱試驗方法。例如,在溫度為925℃時每隔15mim浸泡和加熱交替進行一次。該法并不是廣泛使用的方法。耐蝕性是根據去除氧化皮后的質量變化來評定。

    ⑤浸泡斷裂試驗:該法是將大氣中蠕變斷裂試驗裝置加以改進,試驗介質為合成灰,在全浸狀態下進行試驗。試驗的結果與大氣中的蠕變斷裂相比較,若斷裂壽命縮短,則認為是合成灰腐蝕影響所致。此外,也有的是將合成灰在水中調制成糊狀涂敷在蠕變斷裂試樣卜.然后加執講行試驗。耐蝕性是用空氣中和在灰分中的蠕變斷裂壽命之比來評價。

    ⑥氧消耗MM的測定試驗:考慮到灰分腐蝕有加速氧化現象,所以該法通過測定密閉容器‘!,氧的消耗址來評價腐蝕性。試樣置于電爐中的石英管里,并與合成灰反應,氧的消耗星可山其體積的變化來測定。

    ⑦電化學試驗:該法是將試樣浸泡在熔融合成灰中,以測定合金的電位一電流曲線來評價其耐蝕性。此外,也采用在試樣浸泡時通以陽極電流來加速腐蝕的方法。還有的是測定合成灰的電導率,以研究其與腐蝕的關系。

    (2)燃燒裝置試驗

    該法不用合成灰與合金接觸,而是在實驗室將油燃燒,試樣放在油中來進行試驗的方法。這是模擬實際情況的試驗法,具有可任意改變各種影響因素的優點。

    (3)實際裝置試驗

          在實驗室試驗中要對耐蝕性做正確的評價是困難的,所以要在實際裝置中進行試驗,以便對實驗室的結果加以確認。這種方法可正確地把握現象,以評價耐蝕材料的優劣和確定防蝕方法。但該法只是一種綜合評價方法,不能具體地分析每個重要影響因素的作用。雖然隨著裝置的大型化,試驗費用也要提高,但最終還得采用這種方法來評價材料的耐蝕性。

          更多文章請點擊www.modfert.com。

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