ASTM B635-00(2023)

Standard Specification for Coatings of Cadmium-Tin Mechanically Deposited

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STANDARD published on 1.5.2023

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The information about the standard:

Designation standards: ASTM B635-00(2023)
Publication date standards: 1.5.2023
SKU: NS-1144992
The number of pages: 8
Approximate weight : 24 g (0.05 lbs)
Country: American technical standard
Category: Technical standards ASTM

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Metallic coatings

Annotation of standard text ASTM B635-00(2023) :

This specification covers the requirements for a coating that is a mixture of cadmium and tin mechanically deposited on metal products. The coating shall be 45 to 75 mass % cadmium, the remainder tin. All steel parts that have ultimate tensile strength of 1000 MPa and above and that contain tensile stresses caused by machining, grinding, straightening, or cold forming operation shall be given a stress relief heat treatment prior to cleaning and metal deposition. High-strength steels that have heavy oxide or scale shall be cleaned before application of the coating in accordance with guide B 242. Chromate treatment for Type II shall be done in a solution containing hexavalent chromium. The cadmium-tin coating shall be sufficiently adherent to the basis metal to pass the prescribed testing. Steel springs and other high-strength steel parts shall be free from hydrogen embrittlement. The coating shall be uniform in appearance and substantially free of blisters, pits, nodules, flaking and other defects that can adversely affect the function of the coating. Chemical composition of the cadmium-tin coating shall be determined when required on the purchase order by procedures given in methods E 87 or test methods E 396. The thickness of the coating shall be determined by the microscopical method, the magnetic method, or the beta backscatter method as applicable. Chromate conversion coatings of cadmium-tin both have an essentially silvery-white appearance. Adhesion of the cadmium-tin deposit to the basis metal shall be tested in a manner that is consistent with the service requirements of the coated article. Coated parts to be tested for the absence of embrittlement from cleaning shall be tested for brittle failure in accordance with a suitable method.

Keywords:
alloy plating, cadmium tin alloy, chemical cadmium tin, corrosion resistant coatings, mechanical cadmium tin, mechanical plated coatings,, ICS Number Code 25.220.40 (Metallic coatings)

Additional information

1. Scope

1.1?This specification covers the requirements for a coating that is a mixture of cadmium and tin mechanically deposited on metal products. The coating is provided in various thicknesses up to and including 12 ?m.

1.2?Mechanical deposition greatly reduces the risk of hydrogen embrittlement and is suitable for coating bores and recesses in many parts that cannot be conveniently plated electrolytically. (See Appendix X1.)

1.3?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

2. Referenced Documents

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).
B487-20	Standard Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section
B567-98(2021)	Standard Test Method for Measurement of Coating Thickness by the Beta Backscatter Method
B571-23	Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
B602-21	Standard Guide for Attribute Sampling of Metallic and Inorganic Coatings
B117-19	Standard Practice for Operating Salt Spray (Fog) Apparatus
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).
B697-88(2021)	Standard Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings
B762-21	Standard Guide of Variables Sampling of Metallic and Inorganic Coatings
E87-58 (1978)	Methods for Chemical Analysis of Lead, Tin, Antimony and Their Alloys (Photometric Method) (Withdrawn 1984)
E396-17	Standard Test Methods for Chemical Analysis of Cadmium
B183-18(2022)	Standard Practice for Preparation of Low-Carbon Steel for Electroplating
B201-80(2019)	Standard Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces
F1470-24	Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
FED-STD-141	Paint, Varnish, Lacquer, and Related Materials; Methods of Inspection, Sampling and Testing Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.

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