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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A suitable tool is a steel rod 6 mm in diameter with a smooth hemispherical end. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may astn. In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements.
Generally, thick deposits cannot be evaluated satisfactorily. Supporting the material on a ring about 2. Soft or thin coatings cannot be evaluated for adhesion by this method. The standard describes several different tests and tables to compare different metallic coatings for a given application. Adhesive-backed tape may be considered as a possible alternative.
If the coating peels,? If a part requires baking or heat treating after plating, adhesion tests should be carried out after such posttreatment as well.
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. Make sure that any loose astmm particles from scribing do not remain. This test practice is a simple set of tests to determine the adhesion of metallic coatings on various substances. 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.
A knife may be substituted for the chisel with or without hammering or light tapping. These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings.
This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, scribing, chiseling, or a combination of such treatments. It is the responsibility of b51 user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. No other units of measurement are included in this standard.
Sstm the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable. Alternatively the chisel may be placed in back of an overhang area asttm the coating or at a coatingsubstrate interface exposed by sectioning the article with a saw. A number in parentheses indicates the year of last reapproval. Such cracks may or may b51 propagate into the substrate.
Rated to 10 kN 2, lbf Can be paired with adapters to yield non-perpendicular peels Maintains constant peel angle throughout the test. The choice for each situation must be determined. Examine the deformed area visually under low magni?
Originally approved in If more than one test is used, failure to pass any one test is considered unsatisfactory.
The severity of the test may be altered by changing the load and diameter of the ball.
These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a specific application.
A quantitative analysis of the factors involved has been published. No other units of measurement are included in this standard.
If the coating peels, flakes, or adtm from the substrate, the adhesion is less than perfect. This standard has been approved for use by agencies of the Department of Defense. If it is possible to remove the deposit, the adhesion is not satisfactory. This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, scribing, chiseling, or a combination of such treatments.
This test is commonly used if the coating will peel without tearing. Heat curing of the adhesive may be used, wstm in mind considerations noted in 9. Link to Active This link will always route to the current Active version of the standard.
Work Item s – proposed revisions of this standard. Blisters, lifting, or peeling should not develop.
If any portion of coating between the lines breaks away from the substrate, the adhesion is inadequate. Lifting or peeling is evidence of unsatisfactory adhesion.
These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings. Have a question about conducting the test for this standard? 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 adhesion of the coating may be observed directly or evaluated further by techniques described in Section 5 for detachment atsm the substrate.
This would not give a correct indication of the asym bond strength. Last previous edition approved in as B — 97 The pressure shall be sufficient to burnish the coating at each stroke but not so great as to dig into it.
In some cases, a brittle layer may be created by the materials involved causing peeling as a result of fracture rather than poor adhesion. Blisters may erupt during v571 heat and quench test when plating solution is entrapped in substrate surface pits or pores which are bridged by the deposit.
Reproducible results are more easily obtained by the use of a suitably modi?