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 B571 Adhesion Metals Coating Test Equipment
Deposit continuous to the scribed lines is not considered. Generally, thick deposits cannot be evaluated satisfactorily. Make sure that any loose coating particles from scribing do not b5571. Soft or thin coatings cannot be evaluated for adhesion by this method. The adhesion is not adequate if the tape has deposit adhering to it that comes from the area aetm the scribed lines. These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a speci?
The severity of the test may be altered by changing the load and diameter of the ball. In either case, cracks are not indicative of poor adhesion unless the coating can be peeled back with a sharp instrument. If it is possible to remove the deposit, the adhesion is not satisfactory. In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements. In some cases, a brittle layer may asgm created by the materials involved causing peeling as a result of fracture rather than poor adhesion.
Such adhesion is usually obtained if good electroplating practices are followed. If a part requires baking or heat treating after plating, adhesion tests should be carried out after such posttreatment as well. Lifting or peeling is evidence asttm unsatisfactory adhesion.
Work Item s – proposed revisions of this standard. The pressure shall be sufficient to burnish the coating at each stroke but not so great as to dig into it. If there is peeling or? ASTM B This test practice is a simple set of tests to determine the adhesion of metallic coatings on various substances.
No other units of measurement are included in this standard. Blisters, lifting, or peeling should not develop. 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. In scribing the lines, use sufficient pressure to cut through the coating to the substrate in a single stroke. This standard has been approved for use by agencies of the Department of Defense.
This test practice is a simple set of tests to determine the adhesion of metallic coatings on various substances. The tape shall be wide enough to cover three or more parallel lines of the scribed area. 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.
Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable.
ASTM B Adhesion Metals Coating Test Equipment
If more than one test is used, failure to pass any one test is considered unsatisfactory. A knife may be substituted for the chisel with or without hammering or light tapping. The standard describes several different tests and tables to compare different metallic coatings for a given application.
For reproducible results, the rate of pull, the thickness and width of the strip, and deposit thickness must be standardized. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor aatm astm. This test is commonly used if the coating will peel without tearing.
Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable. 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.
Heat curing of the adhesive may be used, keeping in mind considerations noted in aetm. Exfoliation or blisters in and around indentations are evidence of inadequate adhesion.
asgm 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 number in parentheses indicates the year of last reapproval.
Asfm quench the part in water or other suitable liquid at room temperature. If the coating fractures or blisters, a sharp blade may be used to attempt to lift off the coating.
Vol 22,p. We offer machines, apparatus, testers, tensile grips, test fixtures, clamps, holders, jigs, faces, jaws, extensometers, environmental and humidity chambers, furnaces, baths and custom solutions for unique applications. If the coating peels,? Have a question about conducting the test for this standard? Precision and Bias 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.
ASTM B – ADHESION OF PLATINGS (EXCEPT DRAW TEST)
This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, scribing, chiseling, or a combination of such treatments. The mandrel diameter should be four times the thickness of the sample. The choice for each situation must be determined.
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. If more than one test is used, failure to pass any one test is considered unsatisfactory. Soft and ductile coatings are generally not suited for evaluation.
Prying with a sharp blade will indicate unsatisfactory adhesion by lift off of the coating.