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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Thicker coatings are used for water containers, threaded steel couplings of oil drilling strings, and seacoast atmospheres. Dry and weigh with an accuracy of at least 1 part in Also found on baking pans after re?
The size should be sufficient to accommodate the test specimens with their lowest part at least 75 mm 3 zstm.
The procedure is known as sampling inspection. In this specialized application, the occurrence of whisker growth is sufficiently frequent to be an obstacle to the use of tin.
Tin coatings are used to provide a low contactresistance surface, to protect against corrosion see 1.
A number in parentheses indicates the year of last reapproval. Guide B h545 a large number of plans and also provides guidance in the selection of a plan.
Aztm 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. Remove the articles, rinse them in clean water, wipe and brush as necessary to remove smut antimony residuesand dry.
For mill products, refer to Speci? Government Packaging Requirements S4.
ASTM B | General Metal Finishing
The coating should adhere to the basis metal when subjected to the agreed test;? 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 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. Add to the sodium thiosulfate solution a volume of 0. For some applications, this requirement may be astk to allow for a small number of such defects per unit areaespecially if they are outside of or on the periphery of signi?
MIL-T vs. ASTM B
Historical Version s – view previous versions of standard. In cases of rejection, the seller may make a claim for a rehearing. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
These whiskers frequently are approximately 2. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Three test methods are described in Appendix X3, while a simple dip test is given in Test Method B Where a contact mark is inevitable, its location shall be subject to agreement between the supplier and the purchaser. 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.
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 aatm for the development of bb545 corrosion products at discontinuities. Practically all of the following methods take into account the adtm cause of tin whiskering, which is the presence of stresses in the tin coating 8: A suitable burnishing implement is a copper or steel disk used edgewise and broadside.
Drying can reverse the reaction. Typical Applications Mild service conditions, particularly where the signi?
These articles the inspection lots are inspected and classi? Flow-brightened coatings shall be free of dewetted areas and beads.
MIL-T-10727 vs. ASTM B545
The size of the sample and the criteria of compliance are determined by the awtm of statistics. Mild service conditions with less severe requirements than Class C below.
A thicker coating of nickel may be required in some situations for additional retardation. 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 adtm with any item mentioned in this standard.