ASTM-B545:13(R2021) pdf free download – Standard Specification for Electrodeposited Coatings of Tin.
6.9 Hydrogen Embrittlement Relief—High-tensile strength steels and severely cold-worked steels are susceptible to embrittlement by hydrogen in both cleaning and electroplating operations. See Supplementary Requirements SI and S2 for details.
6.10 Deposit Purity—The tin coating shall he not less than
99 % tin, when tested in accordance with .1. Deliberate alloying for special purposes shall only be allowed when specifically agreed upon between the purchaser and seller (see
X6.3).
7. Sampling
7.1 The sampling plan used for inspection of a quantity of the coated articles shall he as agreed upon between the purchaser and the supplier.
NOTE 6—The procedure for sampling is accomplished by selecting a relatively small number of the finished articles at random. These articles (the inspection lots) arc inspected and classified as complying or not complying with the requirements of the specification. The size of the sample and the criteria of compliance are determined by the application of statistics. The procedure is known as sampling inspection. Three
standards. Test Method B602, Guide B697. and Test Method B762, contain sampling plans that are designed for the sampling inspection of coatings.
Test Method B602 contains four sampling plans. three for use with tests that are non-destructive and one for use when they are destructive. The buyer and seller may agree on the plan or plans to be used. If they do not. Test Method B602 identifies the plan to be used.
Guide B697 provides a large number of plans and also provides guidance in the selection of a plan. When Guide B697 is specified. the buyer and seller must agree on the plan to be used.
Test Method R762 can be used only for coating requirements that have a numencal limit, such as coating thickness. The lest must yield a numerical value, and certain statistical requirements must he met. Test Method B762 contains several plans and also provides instructions for calculating plans to meet special needs. The buyer and seller may agree on tile plan or plans to be used. If they do not. Test Method B762 identifies the plan to he used.
7.2 An inspection lot shall be defined as a collection of coated articles that meet the following requirements: they are of the same kind; have been produced to the same specifications; have been coated by a single supplier at one time, or at approximately the same time, under essentially identical conditions; and are submitted for acceptance or rejection as a group.
7.3 Special Test Specimens—It may be preferable to use special test specimens to represent product in process control or in acceptance inspection when, for example, destructive tests are used and it is desirable not to destroy product or if the test specimen is better adapted to the test. The use of special test specimens. their number, the material from which they are made, their size and shape. and the conditions of their coating shall be as agreed upon by the purchaser and the seller.
8. Test Methods
8.1 Deposit Purity—Atomic absorption or energy dispersion spectrophotometry, or any other methods with a demonstrated uncertainty of less than 10 % of the component measured, may he used to determine impurities.