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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Add to the sodium thiosulfate solution a volume of 0.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Such acceptance or pass-fail criteria, if required, should be part of the product speci? Severe service, including exposure to dampness and mild corrosion from moderate industrial environments. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement b455 such rights, are entirely their own responsibility.
Test Method B contains four sampling plans, three for use with tests that are non-destructive and one for use when they are destructive. Examples are electrical hardware such as cases for relays and coils, transformer cans, screened cages, chassis, frames, and?
The goal is to de? The buyer and seller may agree on the plan or plans to be used. Guide B provides a large number of plans and also provides guidance in the selection of a plan. Similar h545 Class A, but for shorter-term contact applications and short shelf-life requirements, subject to purchaser approval.
A number in parentheses astj the year of last reapproval. The number of articles shall be sufficient to have a total weight of coating of at least 0.
Coatings shall be grouped into six asstm classes, which is based on the minimum thickness and severity of service required for the coating, and three surface appearance types, which is based on the type electroplating process employed.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at asgm address shown below. Other coatings variations, such as surface appearance type 4. Warning—Some contemporary packaging materials may emit fumes that are deleterious to the surface of the coating.
ASTM B – Tin Plating by Keystone Finishing
This abstract is a brief summary of the asgm standard. Maintain pressure sufficient to burnish the? This specification does not cover hot-dipped tin or other non-electrodeposited coatings, and mill products.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Rejection and Rehearing 9. Very severe service conditions, including elevated temperatures, where underlying metal diffusion and intermetallic formation processes are accelerated. Where a contact mark is inevitable, its location shall be subject to agreement between the supplier and the purchaser. Typical Applications Mild service conditions, particularly where the signi? Rejection shall be reported to the seller promptly and in writing.
Parts coated with tin can be assembled safely in contact with iron and steel, tin-coated aluminum, yellow chromated zinc, cadmium, and solder coatings. Thicker coatings are used for water containers, threaded steel couplings of oil drilling strings, and seacoast atmospheres. A suitable burnishing implement is a copper or steel disk used edgewise and broadside. With such thin coatings, a diffusion barrier of nickel may be advantageous, although users should also consider the use of thicker coatings when solderability must be maintained over a period of years 6.
Government Packaging Requirements S4. Nonmagnetic Coatings on Magnetic Basis Metals. 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.
When necessary, preliminary samples showing the?
Cal-Aurum :: Tin Plating Specifications
Moderate exposure astn, usually indoors, but more severe than Class B. These alloying additions, particularly the? 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. When Guide B is speci? The values given in parentheses are for information only.
Porosity increases as the coating thickness decreases, so that minimum thicknesses must be specified for each application.
However, all matte baths except for stannate baths do require the addition of grainre?
Parts coated with tin can be assembled safely in contact with iron and steel, tin-coated aluminum, yellow chromated zinc, cadmium, and solder coatings. 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 atm. 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 n545 service or storage.
These articles the inspection lots are inspected and classi? Corrosion can be expected at discontinuities in the coating such v545 pores due to galvanic couples formed between the tin and the underlying metal through the discontinuities, especially in humid atmospheres.
This standard has been approved for use by agencies of the Department of Defense.
The thickness is less in interior corners and holes. For mill products, refer to Speci?