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WITHDRAWN ASTM B579-73(2015) 1.3.2015 preview

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ASTM B579-73(2015)

Standard Specification for Electrodeposited Coatings of Tin-Lead Alloy (Solder Plate)

STANDARD published on 1.3.2015

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The information about the standard:

Designation standards: ASTM B579-73(2015)
Note: WITHDRAWN
Publication date standards: 1.3.2015
SKU: NS-585702
The number of pages: 5
Approximate weight : 15 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM

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The category - similar standards:

Metallic coatings

Annotation of standard text ASTM B579-73(2015) :

Keywords:

electrodeposited coatings, tin-lead alloy (solder plate), solder, tin-lead alloy, tin-lead ,, ICS Number Code 25.220.40 (Metallic coatings)

Additional information

1. Scope

1.1 This specification covers the requirements for electrodeposited tin-lead coatings on fabricated articles of iron, steel, copper, and copper alloys, to protect them against corrosion (Note 1), to improve and preserve solderability over long periods of storage, and to improve anti-galling characteristics.

Note 1: Some corrosion of tin-lead coatings may be expected in outdoor exposure. In normal indoor exposure, tin-lead is protective on iron, copper, and copper alloys. Corrosion may be expected at discontinuities (pits or pores) in the coating. Porosity decreases as the thickness is increased. A primary use of the tin-lead coating (solder) is with the printed circuit industry as a solderable coating and as an etch mask material.

1.2 This specification applies to electrodeposited coatings containing a minimum of 50 % and a maximum of 70 % tin. The specification applies to mat, bright, and flow-brightened tin-lead coatings.

Note 2: Tin-lead plating baths are composed of tin and lead fluoborates and of addition agents to promote stability. The final appearance may be influenced by the addition of proprietary brighteners. Without brighteners, the coatings are mat; with brighteners, they are semibright or bright. Flow-brightened coatings are obtained by heating mat coatings to above the melting point of tin-lead for a few seconds and then quenching; palm oil, hydrogenated oils, or fats are used as a heat-transfer medium at a temperature of 260 ± 10°C (500 ± 20°F), but other methods of heating are also in use. The maximum thickness for flow-brightening is about 7.5 μm (0.3 mil); thicker coatings tend to reflow unevenly. The shape of the part is also a factor; flat surfaces tend to reflow more unevenly than wires or rounded shapes (Note 3).

Note 3: Volatile impurities in tin-lead coatings will cause bubbling and foaming during flow-brightening resulting in voids and roughness. The impurities can arise from plating solution addition agents and from improper rinsing and processing.

1.3 This specification does not apply to sheet, strip, or wire in the unfabricated form or to threaded articles having basic major diameters up to and including 19 mm (0.75 in.).

2. Referenced Documents

E105-21	Standard Guide for Probability Sampling of Materials
E122-17(2022)	Standard Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process
MIL-STD-105	Sampling Procedures and Tables for Inspection by Attributes Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
MIL-STD-414	Sampling Procedures and Tables for Inspection by Variables for Percent Defective
B183-18(2022)	Standard Practice for Preparation of Low-Carbon Steel for Electroplating
B568-98(2021)	Standard Test Method for Measurement of Coating Thickness by X-Ray Spectrometry
B567-98(2021)	Standard Test Method for Measurement of Coating Thickness by the Beta Backscatter Method
B504-90(2023)	Standard Test Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method
B487-20	Standard Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section
B281-88(2019)e1	Standard Practice for Preparation of Copper and Copper-Base Alloys for Electroplating and Conversion Coatings (Includes all amendments and changes 5/14/2019).
B242-99(2020)	Standard Guide for Preparation of High-Carbon Steel for Electroplating
B322-99(2020)e1	Standard Guide for Cleaning Metals Prior to Electroplating (Includes all amendments and changes 12/7/2020).
B499-09(2021)e1	Standard Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals (Includes all amendments and changes 5/18/2021).

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ASTM B636-84(2010)..

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ASTM B650-95(2013)..

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ASTM B651-83(2015)..

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