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首頁(yè)> 外文學(xué)位 >The effects of dissolved ozone on the corrosion behavior of nickel-based chromium-molybdenum alloys in artificial seawater.
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The effects of dissolved ozone on the corrosion behavior of nickel-based chromium-molybdenum alloys in artificial seawater.

機(jī)譯：溶解臭氧對(duì)鎳基鉻鉬合金在人工海水中腐蝕行為的影響。

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Ozone is currently being considered as an environmental-friendly alternative to chlorine-based marine biocides. The goal of this study was to determine the effects of dissolved ozone on the corrosion behavior of nickel-based Cr-Mo alloys in artificial seawater. Alloys 276, 22, 625, 59 and 690 (UNS N10276, N06022, N06625, N06059 and N06690) were studied, and the results were compared with those obtained for aerated solutions.; It was found that although these alloys undergo uniform transpassive dissolution on crevice-free surfaces in ozonated artificial seawater, the corrosion rates were less than 10 {dollar}mu{dollar}m/y for all alloys. Oxidation of transpassively dissolved nickelous ions caused the formation of a nickel oxide precipitate in ozonated solutions.; An anomalous form of crevice corrosion was displayed by Alloy 276 in ozonated artificial seawater. The corrosion was concentrated in regions containing stagnant solutions and in areas where the geometry of the sample created a boundary layer. This "boundary layer corrosion" (BLC) was typified by uniform corrosion that produced an electropolished finish beneath a brown iron silicate corrosion product. The highest uniform corrosion rates of these areas were 48-72 {dollar}mu{dollar}m/y.; The mechanism of BLC is driven by acidification of a stagnant interfacial area due to the oxidation of transpassively dissolved nickelous ions and passivity enhancing elements. The boundary layer allows only limited diffusion of ozone into the layer, and prevents the nickelous ions and acidified corrosion products from being removed, which, in turn, causes the destabilization of passivity and increased corrosion of these areas.; The occurrence of BLC in nickel-based alloys was related to the weight percent of the alloying elements which enhance passivity, due to their ability to form acidic components when transpassively dissolved. The pitting resistance equivalent number (PREN) calculated using the formula: PREN = Cr + 3.0Mo + 1.65W, indicated that at values of the PREN greater than 50, the alloy becomes susceptible to BLC. At PREN values less than 50, accelerated classical crevice corrosion underneath tight crevices occurs.
機(jī)譯：目前，臭氧被認(rèn)為是基于氯的海洋生物殺滅劑的環(huán)保替代品。這項(xiàng)研究的目的是確定溶解的臭氧對(duì)鎳基鉻鉬合金在人工海水中的腐蝕行為的影響。研究合金276、22、625、59和690（UNS N10276，N06022，N06625，N06059和N06690），并將結(jié)果與??充氣溶液的結(jié)果進(jìn)行比較。已經(jīng)發(fā)現(xiàn)，盡管這些合金在臭氧化的人造海水中在無(wú)裂紋的表面上均勻地進(jìn)行了過(guò)鈍溶解，但是所有合金的腐蝕速率均小于10 {μm}美元/ m。透被動(dòng)溶解的鎳離子的氧化導(dǎo)致在氧化溶液中形成氧化鎳沉淀。 276合金在臭氧化人工海水中顯示出異常形式的縫隙腐蝕。腐蝕集中在溶液停滯的區(qū)域和樣品的幾何形狀形成邊界層的區(qū)域。這種“邊界層腐蝕”（BLC）的特征是均勻腐蝕，在棕色硅酸鐵腐蝕產(chǎn)物下產(chǎn)生電拋光的表面。這些區(qū)域的最高均勻腐蝕速率為48-72 {μm}美元/年； BLC的機(jī)理是由停滯的界面區(qū)域的酸化驅(qū)動(dòng)的，這是由于過(guò)鈍溶解的鎳離子和鈍化增強(qiáng)元素的氧化所致。邊界層僅允許臭氧有限地?cái)U(kuò)散到該層中，并防止除去鎳離子和酸化的腐蝕產(chǎn)物，這繼而導(dǎo)致鈍化的不穩(wěn)定和這些區(qū)域腐蝕的增加。鎳基合金中BLC的出現(xiàn)與合金元素的重量百分比有關(guān)，這些元素增加了鈍性，這是由于它們?cè)谶^(guò)鈍溶解時(shí)能夠形成酸性成分。使用下式計(jì)算的耐點(diǎn)蝕當(dāng)量值（PREN）= PREN = Cr + 3.0Mo + 1.65W，表明當(dāng)PREN的值大于50時(shí)，合金容易受到BLC的影響。當(dāng)PREN值小于50時(shí)，緊密縫隙下方會(huì)加速經(jīng)典縫隙腐蝕。

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