ASTM D610:08(2019) pdf free download – Standard Practice for Evaluating Degree of Rusting on Painted Steel Surfaces.
5.4 Do not consider flow of corrosion products onto the surface of intact coaling that is. “rust bleed” or staining) as part of the surface area rusi It may be helpful to wipe the surface with a damp cloth to remove the rust bleed before evaluating.
5.5 Usc percentage of surface area rusted to identify rust grade (sec Table I). Assign rust rating using rust grade of 0-10 followed by the type of rust distribution identified by S for spot. G for general. P for pinpoint or H for Hybrid.
Note I —The numeneal rust grade %aalc is an csponcnlial function of the area of rust. Planing the rust grade versus area of rust resutis in a straight hue in crniloganthmic courdinate’. ilic slope of the line changes at ID of the area rusted to allow ii to retake differences below acruss rust grades Iram lOio4 while including 10 Ia IOO in rust grades L thmugh 0.
5.6 The visual examples are not required for use of the rust-grade scale since the scale is based upon the percent of the area rusted and any method of assessing area rust may be used to determine the rust grade.
6. Report
6.1 Identify sample or area evaluated.
6.2 Report rust grade using rating of 0- 10.
6.3 Report rust distribution using S for Spot, G for General,
P for Pinpoint and H for Hybrid.
7. Precision and Bias
7.1 No precision or bias statement can be made for this practice.
8. Keywords
8.1 corrosion; rusting