: It applies specifically to Thermal Sprayed Coatings (TSCs) .
: It provides the methods for measurement but does not define what levels of porosity are "acceptable"; those limits are typically set by specific project requirements or industry contracts. Key Test Methods Defined
The standard outlines two main methods for evaluation, both requiring the use of a reflected light metallurgical microscope: astm e2109-01 pdf
: Testing must be done by someone familiar with TSC visual features to distinguish between actual porosity and oxides. How to Access the ASTM E2109-01 PDF
ASTM standards are copyrighted documents. You can obtain the official or its latest reapproved version through authorized distributors: E2109 Standard Test Methods for Determining Area ... - ASTM : It applies specifically to Thermal Sprayed Coatings (TSCs)
: Samples must be prepared according to ASTM Guide E1920 . Poor preparation can create "artifacts" like smearing or pullouts that look like pores but aren't, leading to false results.
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. How to Access the ASTM E2109-01 PDF ASTM
: 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