E2109-01 Pdf !!top!! - Astm

The standard outlines two main methods for evaluation, both requiring the use of a reflected light metallurgical microscope:

: Technicians compare a cross-section of the coating under high magnification against a series of standard reference images that represent various porosity levels. astm e2109-01 pdf

The primary goal of ASTM E2109-01 is to establish consistent procedures for "porosity ratings" on metallographic specimens. Because porosity—the presence of voids or "linear detachments" where coating layers haven't bonded—directly impacts a coating's corrosion resistance and structural integrity, having a standardized measurement is essential. The standard outlines two main methods for evaluation,

: This method uses computerized image analyzers to calculate porosity more objectively, though it requires careful calibration to avoid "halo effects"—where the equipment incorrectly detects phase boundaries as pores. Critical Requirements for Accurate Testing : This method uses computerized image analyzers to

: It applies specifically to Thermal Sprayed Coatings (TSCs) .