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huangguaha木蟲(chóng)之王 (文壇精英)
我不是我
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[求助]
標(biāo)準(zhǔn)引言部分,謝謝
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Crevice corrosion of iron-base and nickel-base stainless alloys can occur when an occlusion or crevice limits access of the bulk environment to a localized area of the metal surface. Localized environmental changes in this stagnant area can result in the formation of acidic/high chloride conditions that may result in initiation and propagation of crevice corrosion of susceptible alloys. In practice, crevices can generally be classified into two categories: (1) naturally occurring, that is, those created by biofouling, sediment, debris, deposits, etc. and (2) man-made, that is, those created during manufacturing, fabrication, assembly, or service. Crevice formers utilized in laboratory and field studies can represent actual geometric conditions encountered in some service applications. Use of such crevice formers in service-type environments are not considered accelerated test methods. The geometry of a crevice can be described by the dimensions of crevice gap and crevice depth. Crevice gap is identified as the width or space between the metal surface and the crevice former. Crevice depth is the distance from the mouth to the center or base of the crevice. |
鐵桿木蟲(chóng) (正式寫(xiě)手)
obscure nacissus
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當(dāng)有閉合和裂縫出現(xiàn)使金屬表面局部區(qū)域無(wú)法和周?chē)蟓h(huán)境接觸時(shí),對(duì)于以鐵或鎳為主的合金就會(huì)發(fā)生隙間腐蝕。在空氣不流動(dòng)的區(qū)域里發(fā)生的局部環(huán)境變化將造成酸/高氯化物情況的形成,而它使本就脆弱的合金開(kāi)始或進(jìn)一步發(fā)生隙間腐蝕。 實(shí)際上,縫隙通常被分為兩類(lèi):(1)自然形成的,即由生物淤積、沉淀、碎片、堆積等造成的(2)人為造成的,即在加工、制造、組裝或維護(hù)過(guò)程中產(chǎn)生的。實(shí)驗(yàn)室和專(zhuān)業(yè)研究方面使用的縫隙樣板,可以呈現(xiàn)在維護(hù)過(guò)程中產(chǎn)生的實(shí)際幾何學(xué)情況。 在服務(wù)型領(lǐng)域使用這些縫隙樣板,并不認(rèn)為是有加速作用的試驗(yàn)方法?p隙的幾何學(xué)信息可用裂縫空隙和深度描述。裂縫空隙指的是金屬表面與裂縫的寬度或空間,深度指的是從開(kāi)口到縫隙中心或底部的距離。 |

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