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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ASTM B – 18 Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
The choice for ast, situation must be determined. Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable. A superscript epsilon e indicates an editorial change since the last revision or reapproval. If the coating fractures or blisters, a sharp blade may be used to attempt to lift off the coating.
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.
ASTM B571 Adhesion Metals Coating Test Equipment
The adhesion of the coating may be observed directly or evaluated further by techniques described in Section 5 g571 detachment from the substrate. In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements.
Such cracks may or may not propagate into the substrate. This standard is subject b5771 revision at any time by the responsible technical committee and must be reviewed every? In either case, cracks are not indicative of poor adhesion unless the coating can be peeled back with a sharp instrument. The mandrel diameter should be four times the thickness of the sample. Generally, thick deposits cannot be evaluated satisfactorily. Precision and Bias In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements.
The tape shall be wide enough to cover three or more parallel lines of the scribed area.
No other units of measurement are included in this b5771. Reproducible results are more easily obtained by the use of a suitably modi? Deposit continuous to the scribed lines is not considered. In some cases, a brittle layer may be created by the materials involved causing peeling as a result of fracture rather than poor adhesion. Link to Active This link will always route to the current Active version of the standard.
ASTM B STANDARD PRACTICE FOR QUALITATIVE ADHESION TESTING OF METALLIC COATINGS_百度文库
If you feel 5b71 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. 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. A knife may be substituted for the chisel with or without hammering or light tapping. This standard has been approved for use by agencies of the Department of B751.
Such adhesion is usually obtained if good electroplating practices are followed. Examine the deformed area visually under low magni?
A suitable tool is a steel rod 6 mm in diameter with a smooth hemispherical end. If the coating peels, flakes, or lifts from the substrate, the adhesion is b71 than perfect. Adhesive-backed tape may be considered as a possible alternative.
Make sure that any loose coating particles from scribing do not remain. A quantitative analysis of the factors involved has been published. If the coating peels,?
Soft and ductile coatings are generally not suited for evaluation. No other units of measurement are included in this standard. Have a question about conducting the test astj this standard? If more than one test is used, failure to pass any one test is considered unsatisfactory. This would not give a correct indication of the as-plated bond strength. Lifting or peeling is evidence of unsatisfactory adhesion.
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