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北京石油化工學(xué)院2026年研究生招生接收調(diào)劑公告

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huangguaha

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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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9.2 Various Designs for Flat Specimens:　各種平面型標(biāo)樣的設(shè)計
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.
圖２給出幾種常見的裂縫制造器（物）設(shè)計的形狀，比如、試樣型、帶型（條形）、Ｏ－環(huán)形、塊形、連續(xù)的和鑲段的墊圈。在很多情況下，兩個裂縫形成器（物）被用來固定在一個平面型標(biāo)樣上，也就是說，兩邊各一個�！�
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).
多種裂縫的組合（ＭＣＡ）具有兩個非金屬的鑲段墊圈，這些（鑲段墊圈）上有一些槽和平臺。圖３　和４　中的設(shè)計只是正在使用的各種多種裂縫的組合的一種。每個平臺，和金屬表面接觸，提供一個裂縫腐蝕開始的可能性位點。由縮甲醛樹脂構(gòu)建的多種裂縫的組合已經(jīng)表明可以抗受海水暴置。其他的非金屬，比如PTFE－氟化碳和水泥，也被應(yīng)用（參考 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.
對于金屬－金屬間縫隙腐蝕測試，平面型墊圈或試樣經(jīng)常被固定在一個較大的測試標(biāo)樣上。所有的組分應(yīng)該是同樣的材料，而且制備時以同樣的方式暴露�！�
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.
當(dāng)用非金屬或金屬扣件（其間用絕緣體）組裝的金屬－金屬元件進(jìn)行裂縫測試時，在扣件和金屬裂縫制造器（物）相接觸部位必然會形成二次性裂縫�！∮械臅r候，這些二次性裂縫的幾何構(gòu)型可能要比原來要測試的主裂縫要嚴(yán)重。　

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