ASTM B456 PDF

A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. Five grades of coatings are provided to corre-spond with the service conditions under which each is expectedto provide satisfactory performance: namely, extended verysevere, very severe, severe, moderate, and mild. Definitionsand typical examples of these service conditions are providedin Appendix X1. It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. Five grades of coatings are provided to corre-spond with the service conditions under which each is expectedto provide satisfactory performance: namely, extended verysevere, very severe, severe, moderate, and mild.

Definitionsand typical examples of these service conditions are providedin Appendix X1. It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse. Referenced Documents2. Current edition approved May 1, Published June Originallyapproved in Last previous edition approved in as B — Whennecessary, the significant surfaces shall be specified by thepurchaser and shall be indicated on the drawings of the parts,or by the provision of suitably marked samples.

These are usedfor measurement of critical characteristics that vary withcurrent density such as thickness, STEP, active sites, etc. Ordering Information5. If the service condition numberis quoted and not the classification number, the manufacturer isfree to supply any of the types of coatings designated by the3Available from International Organization for Standardization ISO , 1, ch.

On request, the manufacturer shall inform thepurchaser of the classification number of the coating applied. Alternatively, samples showing the required finish orrange of finish shall be supplied or approved by the purchaser. Product Requirements6.

On articles where a visible contact markis unavoidable, its position shall be agreed upon by thepurchaser and the plater. The electroplated article shall be cleanand free of damage.

NOTE 1—To minimize problems of this type, the specifications coveringthe basis material or the item to be electroplated should contain appro-priate limitations on such basis metal conditions.

Furthermore, areas suchas welds may be excluded from certain performance criteria based uponmutual agreement of purchaser and supplier. Accordingly, theapplicable practices for the preparation of various basis metalsfor electroplating shall be followed. Practices B, B,B, B, and B are examples of practices that may beused for the preparation of basis metals. If the use of copper is permitted, Table 2 may be usedto obtain the same service conditions. NOTE 2—Satin nickel may replace or be deposited over the bright nickellayer per supplier recommendations.

NOTE 3—Substrate condition can have a significant impact on corrosionperformance. Service ConditionNo. Classification No.

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ASTM B456 PDF

More B This specification does not cover plating on plastics. Each coating shall be designated a classification code, which comprises of the following numbers and symbols: service condition number, which indicates the severity of exposure for which the coating is intended; coating classification number, which contains the chemical symbol of each metallic element that comprises the basis metal, or the designated AISI number in the case of stainless steels, and their corresponding thickness; and symbols for expressing the type of coating. Products shall be sampled and inspected accordingly for visual defects, thickness, adhesion, elongation, ductility, corrosion, sulfur content, density, and discontinuities.

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