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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Blisters, lifting, or peeling should not develop. If the coating peels,? Last previous edition approved in as B — 97 A number in parentheses indicates the year of last reapproval. 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. Work Item s – proposed revisions of this standard.
ASTM B – 18 Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
Then quench the part in water or other suitable liquid at room temperature. Coatings and substrates that are sensitive to oxidation should be heated in an inert or reducing atmosphere or a suitable liquid.
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. No other units of measurement are included in this standard.
The choice for each situation must be determined. Soft or thin coatings cannot be evaluated for adhesion by this method. Because the results of tests in cases of marginal adhesion are subject to interpretation, agreement shall be reached on what astk acceptable.
These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a speci? These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings. Originally approved in Historical Version s – view previous versions of standard. In scribing the lines, use sufficient pressure to cut through the coating to the substrate in a single stroke.
If permitted, test panels shall be of the same material and b517 the same surface? Deposit continuous to the scribed lines is not considered. For reproducible results, the rate of pull, the thickness and width of the strip, and deposit thickness must be standardized.
ASTM B571 Adhesion Metals Coating Test Equipment
A quantitative analysis of the factors involved has been published. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. A suitable tool is a steel rod 6 mm in diameter with a smooth hemispherical end.
The tape shall be wide enough to cover three or more parallel lines of the scribed area. Examine the region at low astk
These tests have varying degrees of severity; and one might serve to distinguish between satisfactory and unsatisfactory adhesion in a asym application. This would not give a correct indication of the as-plated bond strength. These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings.
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A knife may be substituted for the chisel with or without hammering or light tapping.
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. Make sure that any loose coating particles from scribing do not remain. If the coating fractures or blisters, a sharp blade may be used to attempt to lift off the coating. Such adhesion is usually obtained if good electroplating practices are followed.
Examine the deformed area visually under low magni? A superscript epsilon e indicates an editorial change since the last revision or reapproval. Link to Active This link will always route to the current Adtm version of the standard.
No other units of measurement are included in this standard.