ASTM B Standard Practice for Qualitative Adhesion Testing of Metallic Coatings. standard by ASTM International, 08/01/ View all product details. ASTM B quantifies various physical properties of metal coating substances such as gold, copper, silver and several others on their adhesion quality via. ASTM B STANDARD PRACTICE FOR QUALITATIVE ADHESION TESTING OF METALLIC COATINGS_建筑/土木_工程科技_专业资料。.
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For reproducible results, the rate of pull, the thickness and width of the strip, and deposit thickness must be standardized. Generally, thick deposits cannot be evaluated satisfactorily. If permitted, asttm panels shall be of the same material and have the same surface?
The choice for each situation must be determined. In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements. This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, scribing, chiseling, or a combination of such treatments. If permitted, test panels shall be of the same material and have the same surface finish as the item to be tested and asfm be processed through the same preplating, electroplating, and postplating cycle with the parts they represent.
We are confident that we have what you are looking for. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
ASTM B – ADHESION OF PLATINGS (EXCEPT DRAW TEST)
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Reproducible results are more easily obtained by aastm use of a suitably modi? The choice for each situation must be determined. Precision and Bias qstm Originally approved in Have a question about conducting the test for this standard?
Heat curing of the adhesive may be used, keeping in mind considerations noted in 9.
ASTM B571 Adhesion Metals Coating Test Equipment
A number in parentheses indicates the year of last reapproval. If the coating peels,? Then quench the part in water or other suitable liquid at room temperature.
These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic bb571. This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, scribing, chiseling, or a combination of such treatments.
If more than one test is used, failure to pass any one test is considered unsatisfactory. Current edition approved April 1, Supporting the material on a ring about 2. Such adhesion is usually obtained if good electroplating asstm are followed.
These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings. Rated to 10 kN 2, lbf Can be paired with adapters to yield non-perpendicular peels Maintains constant peel angle throughout the test. 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 b751 their own responsibility.
Exfoliation or blisters in and around indentations are evidence of inadequate adhesion. These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a speci?
Last previous edition approved in as B — 97 This test is commonly used if the coating will peel without tearing.
In either case, cracks are not indicative of poor adhesion unless the coating can be peeled back atsm a sharp instrument. For example, an article that is to be subsequently formed would suggest a draw or a bend test; an article that is to be soldered or otherwise exposed to heat would suggest a heat-quench test.
ASTM B – 18 Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
If the deposited coating cannot be peeled or lifted from the substrate in an area adjacent to the blister sthe appearance of blisters should not be interpreted as evidence of inferior adhesion.
Historical Version s – view previous versions of standard.
For example, an article that is to be subsequently formed would suggest a draw or a bend test; an article that is to be soldered asm otherwise exposed to heat would suggest a heat-quench test. Blisters, lifting, or peeling should not develop. If the coating peels, flakes, or lifts from the substrate, the adhesion is less than perfect.
Prying with a sharp blade will indicate unsatisfactory adhesion by lift off of the coating. Such cracks may or may not propagate into the substrate. Individual reprints single or multiple copies of this standard may be obtained by contacting Aztm at the above address or at phonefaxor service astm.
If any portion of coating between the lines breaks away from the substrate, the adhesion is inadequate. The pressure shall be sufficient to burnish the coating at each stroke but not so great as to qstm into it. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
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. The adhesion of the coating may be observed directly or evaluated further by techniques described in Section 5 for detachment from the substrate.
Examine the deformed area visually under low magni? In some cases, a brittle layer may be created by the materials involved causing peeling as a result of fracture rather than poor adhesion. The mandrel diameter should be four times the thickness of the sample. A suitable tool is a steel rod 6 mm in diameter with a smooth hemispherical end. A hack saw may be substituted for the wheel, making sure to saw in the direction that tends to separate the coating from the substrate.