Parts are rack or barrel plated to ASTM B standard thicknesses from ” to “, depending on the base metal and application. Pure % tin is. Designation: B – 97 (Reapproved )e1 Standard Speci?cation for Electrodeposited Coatings of Tin1 This standard is issued under the. ASTM B Standard Specification for Electrodeposited Coatings of Tin.
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The surface appearance types are matte tin electrodeposits, bright tin electrodeposits, and flow-brightened electrodeposits. The method provided, which depends on the production of sulfur dioxide from the reaction between sodium thiosulfate and sulfuric acid within the test chamber, ensures suitable conditions for the development of immobile corrosion products at discontinuities.
If they do not, Test Method B identi? Moderate exposure conditions, usually indoors, but more severe than Class B. Thicker coatings are used for water containers, threaded steel couplings of oil drilling strings, and seacoast atmospheres. It is informational only and not an official part of the standard; the full text of the standard astn must be aastm to for its use and application.
The test must yield a numerical value, and certain statistical requirements must be met. Suspend the test specimens above this solution on nonmetallic supports, with the surfaces of the specimens not less than 25 mm 1 in. A number in parentheses indicates the year of last reapproval.
Diffusion may lead to darkening of a thin coating and impairment of its solderability characteristics, particularly after long storage. To provide corrosion and tarnish resistance where greater thicknesses may be detrimental to the mechanical operation of the product for example, small electrical spring contacts and relays.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. They shall be adherent and visually free of blisters, pits, peeled areas, cracks, nodules, and unplated areas. The goal is to de? Product that shows coating imperfections in subsequent manufacturing operations may be rejected.
The purchaser shall specify whether the tested articles are to receive an arti?
Historical Version s – view previous versions of standard. A suitable burnishing implement is a copper or steel disk used edgewise and broadside.
Poor adhesion will be shown by the appearance of a loose blister that grows as rubbing is continued. However, some of these platings cannot be used in contact with food.
Cal-Aurum :: Tin Plating Specifications
It is the responsibility of the user of this standard to satm appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The procedure is known as sampling inspection.
Some tin coatings, especially of bright tin, may show? Tin coatings are used to provide a low contact-resistance surface, to protect against corrosion see 1. The shape of the part is also a factor;?
All surfaces shall be substantially free of grease or oil used in the? Although the tin surface will remain bright for long periods in the absence of moisture, this invisible surface oxide layer is not truly protective.
Examples are electrical hardware such as cases for relays and coils, transformer cans, screened cages, chassis, frames, and? This is in contrast to strikes or? Where a contact mark is inevitable, its location shall be subject to agreement between the supplier and the purchaser.
Rejection shall be reported to the seller promptly and in writing. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Also found on baking pans after re?
MIL-T-10727 vs. ASTM B545
Initial scanning should be conducted for all elements in order to detect any unknown or unexpected impurities. Rejection and Rehearing 9. For mill products, refer to Specifications A or AM. This specification covers the requirements for electrodeposited tin coatings applied to metallic articles to provide a low contact resistance surface, to protect against corrosion, to facilitate soldering, to provide anti-galling properties, and to be a stop-off coating in the nitriding of high-strength steels.
A thicker coating of nickel may be required in some situations for additional retardation. When necessary, preliminary samples showing the?