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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This test is commonly used if the coating will peel without tearing. A suitable tool is a steel rod 6 mm in diameter with a smooth hemispherical end. A number in parentheses indicates the year of last reapproval. Link to Active This link will always route to the current Active version of the standard.
Heat curing of the adhesive may be used, keeping in mind considerations noted in 9. If any portion of coating between the lines breaks away from the substrate, the adhesion is inadequate. This standard has been approved for use by agencies of the Department of Defense. Precision and Bias These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a specific application.
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.
Generally, thick deposits cannot be evaluated satisfactorily. Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable.
Such adhesion is usually obtained if good electroplating practices are followed. Soft or thin coatings cannot be evaluated for adhesion by this method. The pressure shall be sufficient to burnish the coating at each stroke but not so great as to dig into it. If it is possible to remove b51 deposit, the adhesion is not satisfactory. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
No other units of measurement are included in this standard. 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.
These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings. Supporting the material on a ring about 2. The choice for each situation must be determined.
This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, scribing, chiseling, or a combination of such treatments. Make sure that any loose coating particles from scribing do astj remain. Current edition approved April 1, This would not give a correct indication of the as-plated bond strength. 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.
ASTM B571 Adhesion Metals Coating Test Equipment
Examine the deformed area visually under low magni? Last previous edition approved in as B — 97 These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a speci?
Soft and ductile coatings are generally not suited for evaluation. If permitted, test panels shall be of the asym 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 choice for each situation aatm be determined. If the coating peels, flakes, or lifts from the substrate, the adhesion is less than perfect. Historical Version s – view previous versions of standard.
These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings. 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 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. Originally approved in The severity of the test may be altered by changing the load and diameter of the ball.
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 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 astn. A quantitative analysis of the factors involved has been published. If there is peeling or? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
ASTM B – 18 Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
In many instances, the end use of the coated article or its ashm of fabrication will suggest the technique that best represents functional requirements.
For reproducible results, the rate of pull, the thickness and width of the strip, and deposit thickness must be standardized. Then quench the wstm in water or other suitable liquid at room temperature. 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.