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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Such acceptance or pass-fail criteria, if required, should be part of the product speci? The purchaser shall specify whether the tested adtm are to receive an arti?
Cal-Aurum :: Tin Plating Specifications
Suspend the test specimens above this solution on nonmetallic supports, with the surfaces of the specimens not less than 25 mm 1 in. The goal is to de? A superscript epsilon e indicates an editorial change since the last revision or reapproval.
In this specialized application, the occurrence of whisker growth is sufficiently frequent to be an obstacle to the use of tin. In cases of rejection, the seller may make a claim for a rehearing. Therefore, in designing for low-voltage electronic equipment where components are closely spaced, tin coatings should either not be used, or whisker formation should be inhibited or prevented by the application of prevention methods.
Blackening at pores will be evidence of porosity. Add to the sodium thiosulfate solution a volume of 0. The thickness is less in interior corners and holes.
Moderate exposure conditions, usually indoors, but more severe than Class B. The test must yield a numerical value, and certain statistical requirements must be met. Some tin coatings, especially of bright tin, may show? A glass plate makes an adequate sstm on the lubricated ground edges of a glass tank. These should be taken into account when designing for special applications. The appearance shall be uniform throughout, insofar as the basis metal will permit.
A bright coating completely covering the signi?
For mill products, refer to Specifications A or AM. ASTM does not give asm warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Practically all of the following methods take into account the chief cause of asttm whiskering, which is the presence of stresses in the tin coating 8: Severe service, including exposure to dampness and mild corrosion from moderate industrial environments. Some examples are given in Appendix X6.
This standard has been approved for use by agencies of the Department of Defense. Thicknesses of 30 to ? Evidence of diffusion is the formation of a layer of copper-tin intermetallic at the interface and diffusion of zinc to the surface if the substrate is brass.
It is the responsibility of the user of this standard to establish appropriate safety and health astmm and determine the applicability of regulatory limitations prior to use. Rejection and Rehearing 9. Tin coatings are used to provide a low contactresistance surface, to protect against corrosion see 1. Parts coated with tin can be assembled safely in contact with iron and steel, tin-coated aluminum, yellow chromated zinc, cadmium, and solder coatings.
Poor adhesion will be shown by the appearance of a loose blister that grows as rubbing is continued.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. The amount of porosity in the coating that may be tolerable depends on the severity of the environment that the article is likely to encounter during service or storage.
MIL-T-10727 vs. ASTM B545
Applications are as follows: If special test specimens are used 7. Three standards, Test Method BGuide Band Test Method B aastm, contain sampling plans that are designed for the sampling inspection of coatings. For mill products, refer to Speci?
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor v545 astm. Examples are electrical hardware such as cases for relays and coils, transformer cans, screened cages, chassis, frames, and?
Poor adhesion will be shown if the coating blisters, cracks, or peels. H545 shall be adherent and visually free of blisters, pits, peeled areas, cracks, nodules, and unplated areas.
The values given in parentheses are for information only. NOTE 2—Careful preparation of metal surfaces is necessary in order to assure good adhesion and quality. A number in parentheses indicates the year of last reapproval. If the full thickness is required on these surfaces, the electroplater will have asstm use special techniques that probably will increase the cost of the process.