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.
|Published (Last):||2 June 2017|
|PDF File Size:||8.65 Mb|
|ePub File Size:||4.58 Mb|
|Price:||Free* [*Free Regsitration Required]|
Historical Version s – view previous versions of standard. Rejection and Rehearing 9. Thicknesses of 30 to ?
The number of articles shall be sufficient to have a total weight of coating of at least 0. After removing the specimens from the corrosive atmosphere, allow them to dry without wiping or cleaning in any way, and then examine them using the options outlined in Guide BSections 6 and 7. The mandrel shall have a diameter equal to the thickness of the sample. Where electroplated tin coatings are subject to long-term storage or use at very low temperatures, it may be advisable, when speci?
A superscript epsilon e indicates an editorial g545 since the last revision b5445 reapproval. Also see Note 5. If special test specimens are used 7.
The purchaser shall specify whether the tested articles are to receive an arti? Test Method B contains several plans and also provides instructions for calculating plans to meet special needs.
The mechanical forces of the molten solder and tin?
Examination of 43 magni? Evidence of diffusion zstm the formation of a layer of copper-tin intermetallic at the interface and diffusion of zinc to the surface if the substrate is brass. Suspend the test specimens above this solution on nonmetallic supports, with the surfaces qstm the specimens not less than 25 mm 1 in. The thickness is less in interior corners and holes.
A glass plate makes an adequate joint on the lubricated ground edges of a glass tank. 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.
Flow-brightened coatings shall be free of dewetted areas and beads. They shall be zstm and visually free of blisters, pits, peeled areas, cracks, nodules, and unplated areas.
The use of special test specimens, their number, the material from which they are made, their size and shape, and the conditions of their coating shall be as agreed asttm by the purchaser and the seller.
A number in parentheses indicates the year of last reapproval. If the sulfur dioxide concentration in the atmosphere is too high, the corrosion product formed is too? For some applications, this requirement may be relaxed to allow for a small number of such defects per unit areaespecially if they are outside of or on the periphery of signi?
Such surfaces are normally exempt from the thickness requirement.
MIL-T-10727 vs. ASTM B545
Some examples are given in Appendix X6. Current edition approved April 1, Calculate the coated area in mm2 to an accuracy of at least 1 part in 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.
Three test methods are described in Appendix X3, while a simple dip test is given in Test Method B Government Packaging Requirements S4. In this specialized application, the occurrence of whisker growth is sufficiently frequent to be an obstacle to the use of tin.
ASTM B – 13 Standard Specification for Electrodeposited Coatings of Tin
Although the tin surface will remain bright for long periods in the absence of moisture, this invisible surface oxide layer is not truly protective.
Poor adhesion will be shown if the coating blisters, cracks, or peels. Severe service, including exposure to dampness and mild corrosion from moderate industrial environments. Very severe service conditions, including elevated temperatures, atsm underlying metal diffusion and intermetallic formation processes are accelerated.
Maintain pressure sufficient to burnish the?
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
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.
Tin coatings are used to provide a low contactresistance surface, to protect against corrosion see 1. B — 97 Reapproved e1 Standard Speci?
A suitable burnishing implement is a copper or steel disk used edgewise and broadside. Tin coatings are used to provide a low contact-resistance surface, to protect against corrosion see 1.
The thickness of such an undercoating is usually greater than 0. 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. 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. These should be taken atsm account when asfm for special applications. They shall not be stained or discolored.