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Mass loss data calculated from specimen weighing before and after testing may provide some useful information in specific cases. However, comparisons of alloy performance based solely on mass loss may be misleading because highly
localized corrosion, which is typical of crevice corrosion, can often result in relatively small mass losses.
9. Crevice Formers
9.1 General Comments:
9.1.1 The severity of a crevice-corrosion test in a given environment can be influenced by the size and physical properties of the crevice former.
9.1.2 Both metal-to-metal and nonmetal-to-metal crevice components are frequently used in laboratory and field studies.
9.1.3 Nonmetallic crevice formers often have the capacity for greater elastic deformation and may produce tighter crevices which are generally considered to more readily promote crevice-corrosion initiation. Acrylic plastic, nylon,
polyethylene, PTFE-fluorocarbons, and acetal resin are a few of the commonly used nonmetallics.
9.1.4 The properties of the nonmetallic crevice former must be compatible with the physical and environmental demands of the test.
9.1.5 Regardless of the material or type of crevice former, contacting surfaces should be kept as flat
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