2.1 These tests are useful for production control and for acceptance testing of products.
2.2 Interpreting the results of qualitative methods for determining the adhesion of metallic coatings is often a controversial subject. If more than one test is used, failure to pass any one test is considered unsatisfactory. In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements. For example, an article that is to be subsequently formed would suggest a draw or a bend test; an article that is to be soldered or otherwise exposed to heat would suggest a heat-quench test. If a part requires baking or heat treating after plating, adhesion tests should be carried out after such posttreatment as well.
2.3 Several of the tests are limited to specific types of coatings, thickness ranges, ductilities, or compositions of the substrate. These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings.
Adhesion Test | Coating MaterialA | |||||||||||||||||
Cadmium | Chromium | Copper | Lead and | Nickel | Nickel and | Palladium | 涂層測厚儀的原理和影響因素
涂層測厚儀采用電磁感應法測量涂層的厚度,具有測量誤差小、可靠性高、穩定性好、操作簡便等特點,是控制和保證產品質量必不可少的檢測儀器,廣泛地應用在制造業、金屬加工業、化工業、商檢等檢測領域。?原理:利用從測頭經過非鐵磁覆層而流入鐵磁基體的磁通的大小,來測定覆層厚度。也可以測定與之對應的磁阻的大小,來表示其覆層厚度。覆層越厚,則磁阻越大,磁通越小。... ASTM B571-97(2013) 中可能用到的儀器設備誰引用了ASTM B571-97(2013) 更多引用
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