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huangguaha木虫之王 (文坛精英)
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9.2 Various Designs for Flat Specimens: 9.2.1 Fig. 2 shows the shapes of a few popular crevice former designs, such as coupons, strips, O-rings, blocks, continuous and segmented washers. In many cases, two crevice formers are fastened to a flat specimen, that is, one on each side. 9.2.2 Multiple crevice assemblies (MCA) consist of two nonmetallic segmented washers, each having a number of grooves and plateaus. The design shown in Figs. 3 and 4 is only one of a number of variations of the multiple crevice assembly which are in use. Each plateau, in contact with the metal surface, provides a possible site for initiation of crevice corrosion. Multiple crevice assemblies fabricated of acetalresin have been shown to be suitable for seawater exposures.Other nonmetallics, such as PTFE-fluorocarbon and ceramic,have also been used (see 9.1.4). 9.2.3 For metal-to-metal crevice-corrosion tests, flat washers or coupons are often fastened to a larger test specimen. All components should be of the same material and prepared for exposure in the same manner. 9.2.3.1 Crevice testing with metal to metal components assembled with either nonmetal or metal fasteners (with insulator) will necessarily result in the formation of secondary crevice sites where the fastener contacts the metallic crevice former. In some cases, the geometry of these secondary sites may be more severe than the intended primary crevice site. |
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铁杆木虫 (著名写手)
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9.2 Various Designs for Flat Specimens: 各种平面型标样的设计 9.2.1 Fig. 2 shows the shapes of a few popular crevice former designs, such as coupons, strips, O-rings, blocks, continuous and segmented washers. In many cases, two crevice formers are fastened to a flat specimen, that is, one on each side. 图２给出几种常见的裂缝制造器（物）设计的形状，比如、试样型、带型（条形）、Ｏ－环形、块形、连续的和镶段的垫圈。在很多情况下，两个裂缝形成器（物）被用来固定在一个平面型标样上，也就是说，两边各一个。 9.2.2 Multiple crevice assemblies (MCA) consist of two nonmetallic segmented washers, each having a number of grooves and plateaus. The design shown in Figs. 3 and 4 is only one of a number of variations of the multiple crevice assembly which are in use. Each plateau, in contact with the metal surface, provides a possible site for initiation of crevice corrosion. Multiple crevice assemblies fabricated of acetalresin have been shown to be suitable for seawater exposures.Other nonmetallics, such as PTFE-fluorocarbon and ceramic,have also been used (see 9.1.4). 多种裂缝的组合（ＭＣＡ）具有两个非金属的镶段垫圈，这些（镶段垫圈）上有一些槽和平台。图３ 和４ 中的设计只是正在使用的各种多种裂缝的组合的一种。每个平台，和金属表面接触，提供一个裂缝腐蚀开始的可能性位点。由缩甲醛树脂构建的多种裂缝的组合已经表明可以抗受海水暴置。其他的非金属，比如PTFE－氟化碳和水泥，也被应用（参考 9.1.4)。 9.2.3 For metal-to-metal crevice-corrosion tests, flat washers or coupons are often fastened to a larger test specimen. All components should be of the same material and prepared for exposure in the same manner. 对于金属－金属间缝隙腐蚀测试，平面型垫圈或试样经常被固定在一个较大的测试标样上。所有的组分应该是同样的材料，而且制备时以同样的方式暴露。 9.2.3.1 Crevice testing with metal to metal components assembled with either nonmetal or metal fasteners (with insulator) will necessarily result in the formation of secondary crevice sites where the fastener contacts the metallic crevice former. In some cases, the geometry of these secondary sites may be more severe than the intended primary crevice site. 当用非金属或金属扣件（其间用绝缘体）组装的金属－金属元件进行裂缝测试时，在扣件和金属裂缝制造器（物）相接触部位必然会形成二次性裂缝。 有的时候，这些二次性裂缝的几何构型可能要比原来要测试的主裂缝要严重。 |
2楼2013-03-14 01:39:16
