ASTM B490-2009 Standard Practice for Micrometer Bend Test for Ductility of Electrodeposits《用测微计弯曲试验法测定电解沉积物的延展性》.pdf
《ASTM B490-2009 Standard Practice for Micrometer Bend Test for Ductility of Electrodeposits《用测微计弯曲试验法测定电解沉积物的延展性》.pdf》由会员分享,可在线阅读,更多相关《ASTM B490-2009 Standard Practice for Micrometer Bend Test for Ductility of Electrodeposits《用测微计弯曲试验法测定电解沉积物的延展性》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 490 09Standard Practice forMicrometer Bend Test for Ductility of Electrodeposits1This standard is issued under the fixed designation B 490; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、 number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice describes a procedure for measuring theductility of electrodeposited foils.21.2 This practice is suitable only for the e
3、valuation ofelectrodeposits having low ductility.1.3 The obtained ductility values must only be consideredsemi-quantitative because this test has a significant operatordependence.1.4 This practice is best used for in-house process controlwhere measurements are always made by the same operator. Achan
4、ge in ductility value can be used as an indication ofpossible changes in the electroplating solution.1.5 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.6 This standard does not purport to address the safetyproblems, if any, a
5、ssociated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:3B 456 Specification for Electrodeposited Coatings of Cop-p
6、er Plus Nickel Plus Chromium and Nickel Plus Chro-mium3. Summary of Practice3.1 This practice consists of measuring the bend of a foilheld between the jaws of a micrometer; these are closed untilfracture or cracks appear.4. Significance and Use4.1 This practice is useful as one method of controlling
7、some electroplating solutions. It serves to indicate the presenceof contamination or some other adverse condition.4.2 Ductility measurements are of particular value whenelectroplated parts are to be subjected to moderate stress suchas that involved in bolting an electroplated bumper to anautomobile
8、or when exposed to a wide range of fluctuatingtemperatures (thermal shock).5. Apparatus5.1 Micrometer, 25-mm with flat jaws to measure thethickness and to compress the foil.5.2 Tools such as a hand or power shear, grinding wheel, fileor hack saw, to initiate separation of the foil from the basismeta
9、l.5.3 Pair of Sharp Scissors to cut the test specimens.6. Test Specimens6.1 An electrodeposit shall be prepared using a basis metalwith a smooth surface from which the electrodeposit can bereadily separated. Proper preparation of the surface from whichthe foil must be separated undamaged is critical
10、. The depositshall be electroplated at an average current density and underconditions (agitation, temperature, etc.) approximating thoseused on parts electroplated in the solution being tested. Thedeposit thickness shall be 25-30 m. The panels are prepared asin 6.2.6.2 The test panel must be properl
11、y passivated beforeplating to allow for separation of the subsequent deposit.Stainless steel, brass or nickel dipped in a chromic acidsolution (see Note 1) for approximately 1 minute can be usedas the basis metal. The panel should be properly rinsed beforeplating. Entering the solution with current
12、on is recommendedto prevent activation of the basis metal. When testing nickeldeposits, other than rinsing, no post treatments shall be used.An alternative method is described in Note 2.NOTE 1For convenience, an ordinary hexavalent chromium electro-plating solution can be used for preparing the basi
13、s metal.NOTE 2As an alternative basis metal, a piece of cold-rolled steel ofany convenient size, such as 100 by 150 mm, shall be properly cleaned,rinsed, acid dipped, rinsed and electroplated with approximately 7.5 m of1This practice is under the jurisdiction of ASTM Committee B08 on Metallicand Ino
14、rganic Coatings and is the direct responsibility of Subcommittee B08.10 onTest Methods.Current edition approved April 15, 2009. Published May 2009. Originallyapproved in 1968. Last previous edition approved in 2008 as B 490 92 (2008)1.2For a discussion of this test see Mohrnheim, A. F., “The Bend Te
15、st forMeasuring the Strain Limit of Surfaces,” Plating, Vol 50, 1963, pp. 10941099.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary pa
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