ASTM-B545:13 pdf free download – Standard Specification for Electrodeposited Coatings of Tin.
8.2 Thickness:
8.2. 1 Standard Thickness—The coating thickness shall be measured at locations on significant surfaces by one of the following test methods: Test Methods B487, B499 (magnetic substrates only), B504, B567, and B568. Practice B659 may be consulted to determine the most appropriate test method.
8.2.1.1 When Methods B504 and B568 are used with tin platings that have been alloyed with more than 0.5 % of lead, bismuth, or antimony to reduce whiskering (see X6.3.2.5), the standard shall have the same composition as the coating. When Test Method B567 is used to measure these types of coatings, the measuring instrument shall he calibrated with thickness standards that have the same substrate and same composition of coating as the product.
8.2.2 Mean Thickness—If the entire surface of the article is a significant surface, the mean thickness can also he determined by the method described in Appendix X 1. Also see Note
8.3 Adhesion—Adhesion of the coating shall be tested by one of the recommended methods of Practice B57 1 (see Appendix X2).
8.4 Solderabilitv—For coatings that must be solderable. the method by which solderability is tested shall be specified. Three test methods are described in Appendix X3, while a simple dip test is given in Test Method B678. The purchaser shall specify whether the tested articles are to receive an artificial aging treatment, such as that given in Test Method B678, so as to demonstrate whether the articles may be expected to retain their solderability during long storage periods.
8.5 Porosity and Gross Defects Testing:
8.5.1 Coatings on articles of steel (or iron) having a local thickness of 10 i (0.4 mil) or greater should be subjected to the test given in Appendix X5.
8.5.2 For coatings on articles made from copper or copper alloy as the basis metal, the following tests should he used:
8.5.2.1 To determine mechanical damage or gross defects only, subject samples to the sodium polysulfide immersion test outlined in Specification B246. Black spots or lines are evidence of mechanical damage or gross defects.
8.5.2.2 To determine all porosity that penetrates down to the copper substrate, especially for coatings in Service Class A, the humid sulfur vapor test (Test Method B809) shall be used. Blackening at pores will be evidence of porosity.
9. Rejection and Rehearing
9.1 Articles that fail to conform to the requirements of this specification may be rejected. Rejection shall be reported to the seller promptly and in writing. In cases of rejection, the seller may make a claim for a rehearing. Product that shows coating imperfections in subsequent manufacturing operations may be rejected.
10. Keywords
10.1 electrodeposited tin; electroplated tin; tin; tin coatings.