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Extra info for Metallic And Inorganic Coatings; Metal Powders, Sintered P-M Structural Parts
4. 1 The chemical symbol for the basis metal. 2 The chemical symbol for the undercoating of copper or nickel, if used. 3 The chemical symbol Pb representing lead or the symbol Pb Sn for the lead-tin alloy. When tin is present, the tin content of the coating will appear before the symbol Sn. For example, Pb 5 Sn refers to a coating having the minimum composition 5 mass % tin, remainder lead. 4 A number indicating the minimum thickness of the coating in micrometres (µm). 1. 1 Fe-Pb-5-Sn-40 represents a lead-tin alloy coating having 5 mass % tin content, remainder lead, on a ferrous basis metal.
1). 4 Significant Surfaces—Significant surfaces are defined as those normally visible (directly or by reflection) or are essential to the serviceability or function of the article; or can be the source of corrosion products or tarnish films that interfere with the function or desirable appearance of the article. When necessary, the significant surfaces shall be indicated on the drawings of the parts, or by the provision of suitably marked samples. 11. 1 Composition—The lead-tin alloy coating deposit may be weighed and then analyzed for one of the metals.
The use, for corrosion protection, of coatings less than 12 µm thick is limited to indoor applications or to special situations owing to the possibility of damage during handling and possible increased porosity. 5 The atmospheric corrosion resistance of lead-tin alloy coatings is not adversely affected by additions of tin up to 15 mass %. 2 Where a nickel strike is employed, overheating during any joining operation may cause hot shortness and cracking of the nickel coating, from contamination by the lead and in the lead or lead-tin alloy plate.