This coating removal makes the part or article unusable after testing. If the document is revised or amended, you will be notified by email. 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. Heat may be used to complete the solution of cupric sulfate crystals. By carefully removing the acid, a con?
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Variations can be due to the difference in a29 pressure used to wipe the sample or the inability of the operator to recognize the end point.
A 239 – Preece Test
The solution shall be discarded after completion of the evaluation, and fresh solution shall be used for any additional evaluations.
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Already Subscribed to this document. Likewise, the indication of bright adherent deposits of copper at or adjacent to any cut or abrasion present on the original specimen shall not be considered an end point.
By carefully removing the acid, a con? For example, the solution may have no apparent attack astm a239 all or part adtm the surface, or false deposits of copper may appear on aetm zinc coating. Other factors such as location of the thinnest spot, orientation of the part in service, and specific environmental conditions will also affect the service life. This practice is designed to identify those areas of the part where the coating is thin.
Also excluded from this practice are all zinc-coated wire and wire products either continuously or batch coated before or after forming. Historical Version s – view previous versions of standard.
It has been found advantageous to saw female-threaded parts longitudinally, exposing the threads to full view and facilitating cleaning to remove sponge copper after each astm a239 in the copper sulfate solution.
It is the responsibility of the user of this standard to aztm appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The values given in aztm are mathematical conversions to SI units that are provided for information only and are not considered standard. Please first verify your email before subscribing to alerts. If the document is revised astm a239 amended, you will be notified by email.
A – Preece Test | American Galvanizer’s Association
This standard is not included in any packages. Please first log in with a verified email before subscribing to alerts. Current edition approved Oct. This standard is also available to be included in Standards Astm a239.
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If no appreciable zinc is present, the effervescence will be mild. It is the responsibility of the user of this standard to establish appropriate safety and health practices and astm a239 the applicability of regulatory limitations prior to use.
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Your Alert Profile lists the documents that will be monitored. The specimens may be scrubbed with a cotton cloth during this immersion. Then immerse for 3 min in aastm solution consisting of astm a239 part by volume of ammonium hydroxide sp gr 0. Clean the new specimens in alcohol, rinse, astm a239 wipe dry. Warning —Past research dating from around has indicated that this practice can be influenced by operator technique.
Subscription pricing is determined by: Other awtm such as location of the thinnest spot, orientation of the part in service, and specific environmental conditions will also affect the service life.
The quantity should not be less than 1. Also excluded from this practice are all zinc-coated wire and wire products either continuously or batch a329 before or after forming. Heat may be used to complete the solution of cupric sulfate crystals.