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ASTM B699-86(2021)e1
Standard Specification for Coatings of Cadmium Vacuum-Deposited on Iron and Steel (Includes all amendments and changes 6/25/2021).
NORMA vydaná dňa 1.4.2021
Informácie o norme:
Označenie normy: ASTM B699-86(2021)e1
Dátum vydania normy: 1.4.2021
Kód tovaru: NS-1028634
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM B699-86(2021)e1 :
This specification covers the standard requirements for cadmium coatings vacuum deposited with or without supplementary chromate treatment on iron and steel basis metals. The cadmium metal for the production of the coating and the resultant coating shall conform to the chemical composition requirements as shall be determined by chemical, electrochemical, spectrochemical, or X-ray fluorescence analysis. Steel parts that have been machined, ground, cold-formed, or cold-straightened shall be heat treated for stress relief before cleaning and coating. The basis metal shall undergo surface cleaning, abrasive dry blasting, and outgassing by electron bombardment with high-energy positive ions to ensure satisfactory adhesion, abrasion resistance, and corrosion resistance performance. Chromate treatment shall be done in or with special aqueous acid solutions composed of hexavalent chromium along with certain anions that act as a catalyst or film forming compound to produce continuous, smooth, protective film. Coating adhesion shall be determined either by scraping or shearing with a sharp edge, knife, or razor blade through the coating down to the basis metal; plastically deforming by clamping and bending; or any suitable procedure such as burnishing, draw, or scribe tests. Salt spray corrosion test and visual examination shall also be performed on the coatings.
Keywords:
cadmium coatings, vacuum deposited, vacuum deposited coatings, cadmium,, ICS Number Code 25.220.40 (Metallic coatings)
Doplňujúce informácie
| 1. Scope | ||||||||||||||||||||||||||||||||||||
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1.1?This specification covers the requirements for a cadmium coating vacuum-deposited on iron and steel basis metals. The coating is especially beneficial to those ferrous metals, heat treated to 46HRC and higher or having an ultimate tensile strength greater than 1500 MPa, wherein protection against corrosion and appearance are important (see Appendix X1). 1.2?Vacuum-deposited production items are normally free of hydrogen embrittlement, a danger when using electroplating processes for deposition. Vacuum deposition can handle large high-strength parts that cannot be conveniently mechanically plated in the rotating barrels. 1.3?The coating is provided in various thicknesses up to and including 12 ?m (3.1) either in the as-deposited condition or with a supplementary finish (3.2). 1.4? 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. |
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| 2. Referenced Documents | ||||||||||||||||||||||||||||||||||||
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