ASTM A239 FREE DOWNLOAD

This coating removal makes the part or article unusable after testing. Variations can be due to the difference in hand pressure used to wipe the sample or the inability of the operator to recognize the end point. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. If it is possible to remove the copper with an ink eraser or to peel the copper with the edge of a blunt tool such as the back of a knife blade, and zinc appears underneath the copper, such an appearance of deposited copper shall not be construed as an end point. 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. Also excluded from this practice are all zinc-coated wire and wire products either continuously or batch coated before or after forming.

astm a239

Uploader: Yojin
Date Added: 18 January 2009
File Size: 14.68 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 99298
Price: Free* [*Free Regsitration Required]

Immediately remove the specimen, wash, and wipe it dry. The specimens may be scrubbed with a cotton cloth during this immersion.

The details of the test may be found in technical literature. This standard has been approved for use by agencies of the Department of Defense. 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 immersion in the copper sulfate solution.

Brushing should be parallel to the threads. asttm

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. Your comments are invited either for revision of awtm standard or for additional standards and should be addressed to ASTM International Headquarters.

  ALAIPAYUTHE KANNA SUDHA RAGHUNATHAN FREE DOWNLOAD

This coating removal makes the part or article unusable after testing.

astm a239

The geometry of the part can also in? This practice is to be used only within the limits of Section 1, Scope.

This practice is designed to identify those areas of the part where the coating is thin. This copper-coated reference standard should be prepared at the time this practice is being conducted. Thoroughly rinse the specimens in clean water and wipe dry with a clean cotton cloth. The presence of an excess of cupric hydroxide will be shown aatm the sediment of this reagent at the bottom of the vessel. Current edition approved Oct.

A – Preece Test | American Galvanizer’s Association

Etch the polished surface using an etching solution composed of 20 g of chromic acid, 1. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

astm a239

Partially submerge a zinc-coated specimen in strong hydrochloric acid until violent action ceases. Quantity of Copper Sulfate Solution 5. The quantity should not be asmt than 1. Examine the etched specimen under a microscope, using a magni?

astm a239

Heat may be used to complete the solution of cupric sulfate crystals. The presence of zinc is indicated by immediate vigorous effervescence evolution of hydrogen.

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. Originally published as A — 40 T.

  FINSTERFORST ZUM TODE HIN FREE DOWNLOAD

If heated, the solution shall be allowed to cool. 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. Also excluded from this practice are all zinc-coated wire and wire products either continuously or batch coated before or after forming.

During hot-dip galvanizing, the coating thickness is affected sstm the drainage pattern of the molten zinc, while during zinc spraying metallizingcoating thickness can be dependent on the operator’s manipulation of the spray nozzle.

Past research dating from around has indicated that this practice can be in? Variations can be due to the difference in hand pressure used to wipe the sample or the inability of the operator to recognize the end point. Also excluded from this practice are all zinc-coated wire and wire products either x239 or batch coated before or after forming.

A 239 – Preece Test

If it is desired to use this practice on such material, the corrosion? NOTE 2—The theoretical minimum amount of copper sulfate satm required to dissolve zinc is 0. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.