Image analysis software for measuring layer thickness and porosity on inconel coating samples as per ASTM B ASTM B Test Method for Measurement of Metal and Oxide Coating Thickness by. Microscopical Examination of Cross Section. This test method covers. The results stated above relate only to the specific items tested. Information and statements in this report are derived from material, information.

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Last previous edition B — Some typical etchants are described in Appendix X2. It is usually minimized by overplating the test specimen before mounting. 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. Precision and Bias 9.

This will determine the suitability of the method for measuring the thickness of thin coatings. Etches steel, copper, and copper alloys. Current edition approved Feb. Swab with a fresh solution. Etches nickel; excessive attack on steel and copper alloys. Originally published as B — Coulometric and microscopic cross section thickness analysis, STEP potential, Microporosity using Dubpernell test, Active sites before and after corrosion.

NOTE 1—These techniques will be familiar to experienced metallographers but some guidance is given in Section 5 and in Appendix X1 for less experienced operators.

Micrograph of an automobile plated part with copper and nickel. For silver and gold on copper and nickel alloys and steel.

Coating Thickness ASTM B | Watson Grinding

Etches aluminum and its alloys. A generally satisfactory means of calibration is to assume that the stated length of the full scale is correct, to measure each ashm with a?


Also suitable for zinc and cadmium on steel. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Edge rounding can be caused by improper mounting, grinding, polishing, or etching. Removal of coating material during surface preparation for overplating can cause a low-thickness measurement.

Measurement of the image projected on to a ground-glass plate is usually less satisfactory because of the lack of sharpness of the image and poor legibility of the ruler when the projected image is visible.

Testing Services

The latter has a lower precision. E 3 Methods of Preparation of Metallographic Specimens2 3. This is especially applicable to the chemicals cited in Table X2.

Summary of Test Method b47. Micrograph cross-section showing nickle and copper thickness. For gold, lead, silver, nickel and copper coatings on steel, copper, and copper alloys. For determination of thickness of individual layers of multilayer coatings of nickel on steel and copper alloys; distinguishes each layer of nickel by identifying structures.

This may be minimized by totally immersing abrasive papers in a lubricant during grinding or by using a copious? The measurement will be no more accurate than the calibration of the eyepiece. If a stage micrometer is not certi?

This is usually achieved by overplating the specimen with a coating at least ? Initial grinding should employ or grade abrasive to reveal the true specimen pro? Showing potential difference between semi-bright and bright nickel Showing difference in thickness of bright and semi-bright nickel layers.

This etchant should be freshly prepared. As calibration is operator dependent, the eyepiece shall be calibrated by the person making the measurement. For additional guidance see Methods E 3. Conversion coated aluminum part Electrical resistivity and corrosion testing.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.


For hard, brittle coatings for example oxide or chromium coatings tightly wrapping the specimen in soft aluminum foil before mounting has proved successful. This can be minimized by b87 the measurement quickly and by measuring each interval twice, once asrm left to right and once from right to left.

This standard has been approved for use by agencies of the Department of Defense. 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. Etches zinc, zinc-based alloys and cadmium.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

For a microscope there is a theoretical limit of resolution determined by the numerical aperture NA of the objective. Automobile wheel cap – copper, multilayer nickel and hard chromium plated. A2lA Official Scope and Astj. For anodized aluminum alloys. If you feel that your comments have not received a fair sstm you should make your views known to the ASTM Committee on Standards, at the address shown below.

Sometimes image sharpness can be improved by using monochromatic light.

Measure thickness of aluminum oxide coating.