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  • ASTM B571-97(2013)
    金屬覆層粘附性定性試驗的標準實施規程

    Standard Practice for Qualitative Adhesion Testing of Metallic Coatings


    標準號
    ASTM B571-97(2013)
    發布
    1997年
    發布單位
    美國材料與試驗協會
    替代標準
    ASTM B571-18
    當前最新
    ASTM B571-23
     
     
    適用范圍

    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.

    TABLE 1 Adhesion Tests Appropriate for Various Coatings
  • Adhesion Test

    Coating MaterialA

    Cadmium

    Chromium

    Copper

    Lead and
    Lead/Tin
    Alloy

    Nickel

    Nickel and
    Chromium

    Palladium

    涂層測厚儀原理和影響因素

    涂層測厚儀采用電磁感應法測量涂層厚度,具有測量誤差小、可靠高、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磁通大小,來測定覆層厚度。也可以測定與之對應磁阻大小,來表示其覆層厚度。覆層越厚,則磁阻越大,磁通越小。...


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