BS 6137:1982

Foreword
Cooperating organizations
Specification
1 Scope
2 References
3 Definitions
4 Information to be supplied by the purchaser to the
   electroplater
5 Coating classification
6 Sampling
7 Heat treatment of steel
8 Undercoats
9 Coatings
Appendices
A Guidance information
B Determination of tin content of the coating
C Determination of undercoat thickness and coating
   thickness
D Sulphur dioxide porosity test
E Adhesion tests
Table
1 Service condition and related recommended coating
   thickness
Figures
1 Cabinet with door
2 Hooded cabinet

Essential and additional information to be supplied to the manufacturer, classification of service conditions and coatings. Appendices give guidance notes on use and test methods.

This British Standard specifies requirements for electroplated coatings of tin/lead alloys with a nominal composition of 60 % of tin and actual tin content in the range 55 % to 70 % by mass of tin.

These coatings are intended for use on ferrous and non-ferrous basis metals and also on printed circuit boards.

A classification scheme is included by which the nature of the basis metal and the coating composition can be defined and which also contains provision for flow-melting and bright deposited coatings.

This standard specifies no requirements for the condition, finish or surface roughness of the basis material before electroplating (see A.3.1).

NOTE Attention is drawn to BS 9760, which specifies capability approval procedure and rules for printed circuits of assessed quality.

This standard does not apply to:

1. threaded components (see BS 3382-5);
2. tin/lead coated copper wire (see BS 4393);
3. bearing overlays;
4. terne plate;
5. electroplating of steels with tensile strengths greater than 1 000 MPa (see note to clause 7).