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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Etches copper and copper alloys. A generally satisfactory means of calibration is to assume that the stated length of the full scale is correct, to measure each subdivision with a? Micrograph cross-section showing nickle and copper thickness. A change in tube length may occur when the eyepiece is repositioned within the tube, when the focus of the eyepiece tube is changed, n487, for some microscopes, when the?

This theoretical limit is aatm by good quality microscopes.

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NOTE 1—These techniques will be familiar to experienced metallographers but some guidance is given in Section 5 and in Appendix X1 aastm less experienced operators. For silver and gold on copper and nickel alloys and steel. 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.

Etches zinc, zinc-based alloys and cadmium.

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A2lA Official Scope and Certification. The techniques described in this appendix are intended as guidance for metallographers not experienced in measurements of coating thickness. Under good conditions, when using an optical microscope, the method is capable of giving an absolute measuring accuracy of 0.


This can be minimized by completing the measurement quickly and by measuring each interval twice, once from left to right and once from right to left. Current edition approved Feb. Micrograph cross-section showing varying thickness of nickel over copper.

Initial grinding should employ or grade abrasive to reveal the true specimen pro? The measurement will be no more accurate than the calibration of the eyepiece. Coulometric and microscopic cross section thickness analysis, STEP potential, Microporosity asm Dubpernell test, Active sites before and after corrosion. For hard, brittle coatings for example oxide or chromium coatings tightly wrapping the specimen in soft aluminum foil before mounting has proved successful.

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. This will determine the suitability of the method b478 measuring the thickness of thin coatings. If a stage micrometer is not certi? A superscript epsilon e indicates an editorial change since the last revision or reapproval.

Coating Thickness ASTM B | Watson Grinding

If an especially high degree of surface? It is better to overplate zinc with cadmium and vice versa. Conversion coated aluminum part Electrical resistivity and corrosion testing. Removal of coating material during surface preparation for overplating can cause a low-thickness measurement. An image-splitting eyepiece is advantageous for thin coatings on rough substrate surfaces.

E 3 Methods of Preparation of Metallographic Specimens2 3. Also suitable for zinc and cadmium on steel. Some typical etchants are given in Appendix X2.


For a microscope there is a theoretical limit of ashm determined by h487 numerical aperture NA of the objective.

To verify the absence of v487, the coating thickness should be measured and the polishing, etching, and thickness measurement repeated. Dubpernell Microporosity Test on a copper, nickel, chromium plated automobile part. Users of this standard are expressly advised that determination of the validity of any such patent rights, aztm the risk of infringement of such rights, are entirely their own responsibility.

The apparent boundary may be poorly de? Swab with a fresh solution. If possible, the magni? Micrograph of an automobile plated part with copper and nickel.

Asgm abrasive particles do become embedded, they may be removed by applying a astmm, light hand polish with metal polish after grinding and before diamond? Windowpane Coating thickness measurement and seal quality testing using impedance measurements. For additional guidance see Methods E 3. For nickel and copper coatings on aluminum and its alloys. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

As calibration is operator dependent, the eyepiece shall be calibrated by the person making the measurement. For anodized aluminum alloys. For nickel and copper on zinc-based alloys. 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.