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huangguaha木虫之王 (文坛精英)
我不是我
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[求助]
标准引言部分,谢谢
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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. |
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hanches
铁杆木虫 (正式写手)
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huangguaha: 金币+100, 翻译EPI+1, ★★★★★最佳答案, 非常感谢~~ 2013-03-12 17:11:06
phu_grassman: 金币+2, thanks 2013-03-12 18:17:41
huangguaha: 金币+100, 翻译EPI+1, ★★★★★最佳答案, 非常感谢~~ 2013-03-12 17:11:06
phu_grassman: 金币+2, thanks 2013-03-12 18:17:41
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当有闭合和裂缝出现使金属表面局部区域无法和周围大环境接触时,对于以铁或镍为主的合金就会发生隙间腐蚀。在空气不流动的区域里发生的局部环境变化将造成酸/高氯化物情况的形成,而它使本就脆弱的合金开始或进一步发生隙间腐蚀。 实际上,缝隙通常被分为两类:(1)自然形成的,即由生物淤积、沉淀、碎片、堆积等造成的(2)人为造成的,即在加工、制造、组装或维护过程中产生的。实验室和专业研究方面使用的缝隙样板,可以呈现在维护过程中产生的实际几何学情况。 在服务型领域使用这些缝隙样板,并不认为是有加速作用的试验方法。缝隙的几何学信息可用裂缝空隙和深度描述。裂缝空隙指的是金属表面与裂缝的宽度或空间,深度指的是从开口到缝隙中心或底部的距离。 |

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