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。.
|Published (Last):||3 April 2008|
|PDF File Size:||1.15 Mb|
|ePub File Size:||19.90 Mb|
|Price:||Free* [*Free Regsitration Required]|
Alternatively the chisel may be placed in back of an overhang area of the coating or at a coatingsubstrate interface exposed by sectioning the article with a saw. Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable. Soft or thin coatings cannot be evaluated for adhesion by this method.
Rated to 10 kN 2, lbf Can be paired with adapters to yield non-perpendicular peels Maintains constant peel angle throughout the test. The pressure shall be sufficient to burnish the coating at ashm stroke but not so great as to dig into it. Vol 22,p. Have a question about conducting the test for this standard?
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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
If permitted, test panels shall be of the same asstm and have the same surface? In either case, cracks are not indicative of poor adhesion unless the coating can be peeled back with a sharp instrument. This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, scribing, chiseling, or a combination of such treatments. 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.
Asgm adhesion is usually obtained if good electroplating practices are followed. In many asfm, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements. Blisters may erupt during the heat and quench test when plating solution is entrapped in substrate surface pits or pores which are bridged by the deposit. In scribing the lines, use sufficient pressure to cut through the coating to the substrate in a single stroke. If the coating peels, flakes, or b5571 from the substrate, the adhesion is less than perfect.
ASTM B STANDARD PRACTICE FOR QUALITATIVE ADHESION TESTING OF METALLIC COATINGS_百度文库
Link to Active This link will always route to the current Active version of the standard. This test practice is a simple set of atsm to determine the adhesion of metallic coatings on various substances.
Such cracks may sstm may not propagate into the substrate. Such adhesion is usually obtained if good electroplating practices are followed. Coatings and substrates that are sensitive to oxidation should be heated in an inert or reducing atmosphere or a suitable liquid.
If any portion of coating between the lines breaks away from the substrate, the adhesion is inadequate.
ASTM B Adhesion Metals Coating Test Equipment
Lifting or peeling is evidence of unsatisfactory adhesion. Current edition approved April 1, The choice for each situation must be determined. This standard has been approved for use by agencies of the Department of Defense. These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings. It is the responsibility of axtm user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The tape shall b517 wide enough to cover three or more parallel lines of the scribed area.
ASTM B571 Adhesion Metals Coating Test Equipment
The adhesion is not adequate if the tape has deposit adhering to it that comes from the area between the scribed lines. Heat curing of the adhesive may be used, keeping in mind considerations ast in 9. These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Originally approved in Exfoliation or blisters in and around indentations are evidence of inadequate adhesion. 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. Reproducible results are more easily obtained by the use astj a suitably modi? Make sure that any loose coating particles from scribing do not remain.
If it is possible to remove the deposit, the adhesion is not satisfactory. 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 b5571 test. Then quench the part in water or other suitable liquid at room temperature. If there is peeling or? If more than one test is used, failure to pass any one test is considered axtm.
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 entirely their own responsibility. Because the results of tests in aztm of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable.
Examine the region at low magni?
Blisters, lifting, or peeling should not develop. If permitted, test panels shall be of the same material and have the same surface finish as the item to be tested and shall be processed through the same preplating, electroplating, and postplating cycle with the parts they represent. The standard describes several different tests and tables to compare different metallic coatings for a given application.
It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
If a part requires baking or heat treating after plating, adhesion tests should be carried out after such posttreatment as well. If more than one test is used, failure to pass any one test is considered unsatisfactory.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.