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):||27 March 2006|
|PDF File Size:||14.7 Mb|
|ePub File Size:||7.4 Mb|
|Price:||Free* [*Free Regsitration Required]|
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
MIL-T-10727 vs. ASTM B545
A ast coating completely covering the signi? Three test methods are described in Appendix X3, while a simple dip test is given in Test Method B Porosity increases as the coating thickness decreases, so that minimum thicknesses must be specified for each application.
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 b554 development of immobile corrosion products at discontinuities. 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 upon by the purchaser and the seller.
The values given in parentheses are for information only. See Supplementary Requirements S1 and S2 for details. With such thin coatings, a wstm 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. Maintain pressure sufficient to burnish the?
Flow-brightened coatings shall be free of dewetted areas and beads. A thicker coating of nickel may be required in some situations for additional retardation. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
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 qstm application. NOTE 4—Thickness of electrodeposited coatings varies from point to point on the surfaces of a product see Practice B Coatings shall be grouped into six service 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.
Also found on baking pans after re? 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. Government Packaging Requirements S4. Black spots or lines are evidence of mechanical damage or gross defects. Practice B may be consulted to determine the most appropriate asttm method.
Poor adhesion will be shown by the appearance of a loose blister that grows as rubbing is continued. 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.
ASTM B – standard specification for electrodeposited coatings of tin_百度文库
The purchaser shall specify whether the tested articles are to receive an arti? This standard has been approved for use by agencies of the Department of Defense.
Three standards, Test Method BGuide Band Test Method Bcontain sstm plans that are designed for the sampling inspection of coatings.
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. These whiskers frequently are approximately 2. This is in contrast to strikes or? The surface appearance types are matte tin electrodeposits, bright tin electrodeposits, and flow-brightened electrodeposits.
B — 97 Reapproved e1 Standard Speci? Although the tin surface will remain bright for long periods in the absence of moisture, this invisible surface oxide layer is not truly protective. Other coatings variations, such as surface appearance type 4.
Link to Active This link will always route to the current Active version of the standard. A glass plate makes an adequate joint on the lubricated ground edges of a glass tank. In normal indoor exposure, tin is protective on iron, steel, nickel, copper, and their alloys. Thicknesses of 30 to ?
These articles the inspection lots are inspected and classi? For mill products, refer to Speci? Severe service, including exposure to dampness and mild corrosion from moderate industrial environments.
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 the address shown below. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This abstract is a brief summary of the referenced standard. Moderate exposure aastm, usually indoors, but more severe than Class B.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. If the quality of the deposit is also poor, the blister may crack, and the plating will peel away from the basis metal.
In cases of rejection, the seller may make a claim for a rehearing. Aatm A is often used for tin coatings that are not to be soldered, but must function as low-resistance electrical contact surfaces.
An underplating of nickel or copper atm be used as a diffusion barrier on brass. These should be taken into account when designing for special applications. Dry and weigh with an accuracy of at least 1 part in Remove the articles, rinse them in clean water, wipe and brush as necessary to remove smut antimony residuesand dry.
Addition of the sulfuric acid may be made before b455 test specimens are placed in aastm, provided that the cabinet is closed within 5 min of addition of the acid.
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. Class A Minimum Thickness 2. The procedure is known as sampling inspection.
Guide B provides a large number of plans and also provides guidance in the selection of a plan.