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About This Item
Full Description
This International Standard specifies requirements for electroplated coatings of tin-lead alloy containing between 59 % (m/m) and 70 % (m/m) of tin (see 10.3). It may be used for tin-lead alloys of other compositions but the properties of such coatings may be different from those of the alloy range quoted.
A classification scheme is included by which the nature of the basis metal and the coating composition, within these limits, can be defined and which also contains provision for flow-melting and bright deposited coatings.
The coatings are intended for use on fabricated metal articles and on printed circuit boards.
It does not apply to
- threaded components;
- bearing overlays;
- coatings on sheet, strip or wire in unfabricated form, or of articles made from them;
- electroplating of steels with tensile strength greater than 1000 MPa1) (or of corresponding hardness), because such steels are subject to hydrogen embrittlement (see 8.2).
1) 1 MPa = 1 N/mm2