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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Flow-brightened coatings shall be free of dewetted areas and beads. Typical Applications Mild service conditions, particularly where the signi?
Last previous edition approved in as B — 97e1. If they do not, Test Method B identi? Diffusion may lead to darkening of a thin coating and impairment of its solderability characteristics, particularly after long storage.
Examples are electrical hardware such as cases for relays and coils, transformer cans, screened cages, chassis, frames, and? In normal indoor exposure, tin is protective on iron, steel, nickel, copper, and their alloys. 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. Zstm spots or lines are evidence of mechanical damage or gross defects. The size of the sample and the criteria of compliance are determined by the application of statistics.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Rejection b5455 be reported to the seller promptly and in writing.
They shall not be stained or astn. There needs to be sufficient free tin below the oxide layer in order for this to occur, because the intermetallic compounds formed from tin and the basis metal will not react in this way 7.
B — 97 Reapproved e1 Standard Speci? The appearance shall be uniform throughout, insofar as the basis metal will permit. When Guide B is speci? Corrosion can be expected at discontinuities in the coating such as pores due to galvanic couples formed between the tin and the underlying metal through the discontinuities, especially in humid atmospheres.
Drying can reverse the reaction. These alloying additions, particularly the? If special test specimens are used 7.
Cal-Aurum :: Tin Plating Specifications
Porosity increases as the coating thickness decreases, so that minimum thicknesses must be specified for astn application. Thicknesses of 30 to ? Tin coatings are used to provide a low contactresistance surface, to protect against corrosion see 1. Link to Active This link will always route to the current Active version of the standard.
Such surfaces are normally exempt from the thickness requirement. The size should be sufficient to accommodate the test specimens with their lowest part at least 75 mm 3 in. Also see Note 5.
Some examples are atsm in Appendix X6. 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. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
The buyer and seller may agree on the plan or plans to be used. Where electroplated tin coatings are subject to long-term storage or use at very low temperatures, it may be advisable, when speci? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Initial scanning should be conducted for all elements in order to detect any unknown or unexpected impurities. After removing the specimens from the corrosive atmosphere, allow them to dry without wiping or cleaning in g545 way, and then examine them using the options outlined in Guide BSections 6 and 7.
Such acceptance or pass-fail criteria, if required, should be part of the product speci?
Parts coated with tin can be assembled safely in contact with iron and steel, tin-coated aluminum, yellow chromated zinc, cadmium, and solder coatings. A thicker coating of nickel may be required in some situations for additional retardation.
This is in contrast to strikes or? Warning—Some contemporary packaging materials may emit fumes that are xstm to the surface of the coating. Rejection and Rehearing 9. When Test Method B is used to measure these types of coatings, the measuring instrument shall be calibrated with thickness standards that have the same substrate and same composition of coating as the product.