ASTM D610-08(R2019) pdf free download

ASTM D610-08(R2019) pdf free download.Standard Practice for Evaluating Degree of Rusting on Painted Steel Surfaces
1. Scope
1.1 This practice covers the evaluation of the degree of rusting on painted steel surfaces. The visual examples which depict the percentage of rusting given in the written specifica- tions form part of the standard. In the event of a dispute, the written definition prevails. These visual examples were devel- oped in cooperation with SSPC: The Society for Protective Coatings to further standardization of methods. The photo- graphs can be used to estimate the percentage of other coating defects on various substrates. This standard does not include evaluation of rust propagation around an initially prepared scribe, score, or holiday. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Significance and Use
3.1 The amount of rusting beneath or through a paint film is a significant factor in determining whether a coating system should be repaired or replaced. This practice provides a standardized means for quantifying the amount and distribution of visible surface rust. 3.2 The degree of rusting is evaluated using a zero to ten scale based on the percentage of visible surface rust. 3.3 The distribution of the rust is classified as spot rust, general rust, pinpoint rust or hybrid rust.
4. Interferences
4.1 The visual examples that are part of this practice and the associated rust-grade scale cover only rusting evidenced by visible surface rust. 4.2 The use of the visual examples requires the following cautions: 4.2.1 Some finishes are stained by rust. This staining must not be confused with the actual rusting involved. 4.2.2 Accumulated dirt or other material may make accurate determination of the degree of rusting difficult. 4.2.3 Certain types of deposited dirt that contain iron or iron compounds may cause surface discoloration that should not be mistaken for corrosion. 4.2.4 Failure may vary over a given area. Discretion must therefore be used when selecting a single rust grade or rust distribution that is to be representative of a large area or structure, or in subdividing a structure for evaluation. 4.2.5 The color of the finish coating should be taken into account in evaluating surfaces as failures will be more apparent on a finish that shows color contrast with rust, such as used in these reference standards, than on a similar color, such as an iron oxide finish.
5. Procedure
5.1 Select an area to be evaluated. 5.2 Determine the type of rust distribution using definitions in Table I and visual examples in Fig. I, Fig. 2, and Fig. 3. 5.3 Estimate percentage of surface area rusted using the visual examples in Fig. I, Fig. 2, and Fig.3 or SSPC-VIS 2, or both, by electronic scanning techniques or other method agreed upon by contracting parties. 5.4 Do not consider flow of corrosion products onto the surface of intact coating (that is,“rust bleed” or staining) as part of the surface area rust. It may be helpful to wipe the surface with a damp cloth to remove the rust bleed before evaluating. 5.5 Use percentage of surface area rusted to identify rust grade (see Table 1). 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 1- -The numerical rust grade scale is an exponential function of the area of rust. Plotting the rust grade versus area of rust results in a straight line in semilogarithmic coordinates. The slope of the line changes at 10 % of the area rusted to allow it to resolve differences below 10 % across rust grades from 10 to 4 while including 10 to 100 % in rust grades 3 through 0.