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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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. Last previous edition approved in as B — 97 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. Blisters, lifting, or peeling should not develop.
The mandrel diameter should be four times the thickness of the sample. No other units of measurement are included in this standard.
If more than one test is used, failure to pass any one test is considered unsatisfactory. The tape shall be wide enough to cover three or more parallel lines of the scribed area. If any portion of coating between the lines breaks away from the substrate, the adhesion is inadequate.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Prying with a sharp b517 will indicate unsatisfactory adhesion by lift off of the coating. This test is commonly used if the coating will peel without tearing. This may be prying, hammering, bending, beating, heating, sawing, grinding, pulling, scribing, chiseling, or a combination of such treatments.
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.
Link to Active This link will always route to the current Active version of the standard. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what is acceptable.
If permitted, test panels shall be of the same material and have the same surface?
Heat curing of the adhesive may be used, keeping in mind considerations noted in 9. Such adhesion is usually obtained if good electroplating practices are followed.
Soft and ductile coatings are generally not suited for evaluation. The adhesion is not adequate if the tape has deposit adhering to it that comes from the area between the scribed lines.
These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings.
No other units of measurement are included in this standard. Deposit continuous to the scribed lines is not considered.
If more than one test is used, failure to pass any one test is considered unsatisfactory. If a part requires baking or heat treating after plating, adhesion tests should be carried out after such posttreatment as well.
ASTM B571 Adhesion Metals Coating Test Equipment
Vol 22,p. Alternatively the chisel may be placed in back of an overhang area of the coating or at a coatingsubstrate interface exposed by sectioning the article with a saw.
In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements.
A number in parentheses indicates the year of last reapproval. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
ASTM B – ADHESION OF PLATINGS (EXCEPT DRAW TEST)
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.
This b751 has been approved for use by agencies of the Department of Defense.
Generally, thick deposits cannot be evaluated satisfactorily. Then quench the part in water or other suitable liquid at room temperature. Lifting or peeling is evidence of unsatisfactory adhesion. These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a specific application.
If it is possible to remove the deposit, the adhesion is not satisfactory.