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):||2 February 2012|
|PDF File Size:||20.54 Mb|
|ePub File Size:||19.10 Mb|
|Price:||Free* [*Free Regsitration Required]|
These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a speci? No other units of measurement are included in this standard.
These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a specific application. This would not give a correct indication of the as-plated bond strength.
Last previous edition approved in as B — 97 If the deposited coating cannot be peeled or lifted from the substrate in an area adjacent to the blister saetm appearance of blisters should not be interpreted as evidence of inferior adhesion. A quantitative analysis of the factors involved has been published. This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, b751, chiseling, astn a combination of such treatments. Work Item s – proposed revisions of this standard.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. ASTM B quantifies various physical properties of metal coating substances such as gold, copper, silver and several others on their adhesion quality via various methods for quality standards comparisons. 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.
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 heat-quench test. The standard describes several different tests and tables to compare different metallic coatings for a given application.
Soft and ductile coatings are generally not suited for evaluation.
Such adhesion is usually obtained if good electroplating practices are followed. 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. This standard is subject bb571 revision at any time by the asrm technical asgm and must be reviewed every?
Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable. Make sure that any loose coating particles from scribing do not remain. A knife may be substituted for the chisel with or without hammering or light tapping. 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.
Have a question about conducting the test for this standard?
Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable. If the coating peels,? Adhesive-backed atm may be considered as a possible alternative. Historical Version s – view previous versions of standard. If a part requires baking or heat treating after plating, adhesion tests should be carried out after such posttreatment as well.
B51 the deformed area visually under low magni?
Precision and Bias In many instances, the end use of the coated article or its method of fabrication will suggest the technique that asgm represents functional requirements. 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. Examine the region at low magni?
ASTM B – ADHESION OF PLATINGS (EXCEPT DRAW TEST)
This standard has been approved for use by agencies of the Department of Defense. In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements. If any portion of coating between the lines breaks away from the substrate, the adhesion is inadequate.
This test practice is a simple set of tests to determine the adhesion of metallic coatings on various substances. If the coating peels, flakes, or lifts from the substrate, the adhesion is less than perfect. Rated to 10 kN 2, lbf Can be paired with adapters to yield non-perpendicular peels Maintains constant peel angle throughout the test.
If the coating fractures or blisters, a sharp blade may be used to attempt to lift off the coating. Soft or thin coatings cannot be evaluated for adhesion by this method.
Reproducible results are more easily obtained by the use of a suitably modi? The choice for each situation must be determined. Generally, thick deposits cannot be evaluated satisfactorily. Link to Active This link will always route to the current Active version of the standard. The pressure shall be sufficient to burnish the coating at each stroke but not so great as to dig into it.
ASTM B This test practice is a simple set of tests to determine the adhesion of metallic coatings on various substances.
ASTM B571 Adhesion Metals Coating Test Equipment
Prying with a sharp blade will indicate unsatisfactory adhesion by lift off of the coating. The adhesion ast, not adequate if the tape has deposit adhering to it that comes from the area between the scribed lines. If more than one test is used, failure to pass any one test is considered unsatisfactory. In some cases, a brittle layer may asgm created by the materials involved causing peeling as a result of fracture rather than poor adhesion. Exfoliation or blisters in and around indentations are evidence of inadequate adhesion.
The tape shall be wide enough to cover three or more parallel lines of the scribed area. Current edition approved April 1,