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.
|Published (Last):||18 June 2010|
|PDF File Size:||4.43 Mb|
|ePub File Size:||3.73 Mb|
|Price:||Free* [*Free Regsitration Required]|
Swab with a fresh solution. Etches zinc, zinc-based alloys and cadmium. For nickel and copper coatings on aluminum and its alloys. Removal of coating material during surface preparation for overplating can cause a low-thickness measurement. Originally published as B — Etches steel, copper, and copper alloys. Etches copper and copper alloys. Automobile wheel cap – copper, multilayer nickel and hard chromium plated. The techniques described in this appendix are intended as guidance for metallographers not experienced in measurements of coating thickness.
For hard, brittle coatings for example oxide or chromium coatings tightly wrapping the specimen in soft aluminum foil before mounting has proved successful.
Measure thickness of aluminum oxide coating. Dubpernell Microporosity Test on a copper, nickel, chromium plated automobile part. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Sometimes image sharpness can be improved by using monochromatic light.
Edge rounding can be caused by improper mounting, grinding, polishing, or etching. Preparation of Cross Sections 6. Errors of several percent are not unrealistic unless the scale has been calibrated or has been certi?
B478 practical purposes better resolution cannot be obtained regardless of the quality of the optics or of the total magni? If, before grinding, reference marks are inscribed on the side of the mount, any inclination from horizontal is easily measurable. Last previous edition B — This may be minimized by totally immersing abrasive papers in a lubricant during grinding or by using a copious? 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.
Micrograph of an automobile plated part with copper and nickel. Coulometric and microscopic cross section thickness analysis, STEP potential, Microporosity using Dubpernell test, Active sites before g487 after corrosion. It is not reasonable to specify only one set of techniques, and it is impractical to include all suitable techniques.
For a microscope there is a theoretical limit of resolution wstm by the numerical aperture NA of the objective. Aluminum parts – testing the conductivity and composition Conductivity measurement using eddy current technique and also evaluation of aluminum alloy composition. Windowpane Coating thickness measurement and seal quality testing using impedance measurements.
Current edition approved Feb. Precision and Asfm 9. This will determine the suitability of the method for measuring the thickness of thin coatings. E 3 Methods of Preparation of Metallographic Specimens2 3. Test sealing quality for anodic coatings on aluminum.
The apparent boundary may be poorly de? Under good conditions, when using an optical microscope, the method is capable of giving an absolute measuring accuracy of 0.
ASTM B – Coating Thickness by Cross Section / X-Section
Excessive etching produces a poorly de? If you feel that your comments have not received a fair ashm you should make your views known to the ASTM Committee on Standards, at the address shown below. The latter has a lower precision. B47 additional guidance see Methods E 3. That is, for practical purposes, greater magni? Etches aluminum and its alloys. 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.
Coating Thickness ASTM B | Watson Grinding
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 b4877 is visible. Such a movement during the measurement can cause an erroneous measurement at moderate and high magni?
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?