ASTM D610-07 pdf free download.Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces.
1.1 This test method 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 specilications form part of the standard. In the event of a dispute, the written definition prevails. These visual examples were developed in cooperation with SSPC: The Society for Protective Coatings to further standardization of methods. The photographs 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.
4. Interferences
4.1 The visual examples that are part of this test method 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 he mistaken for corrosion.
4.2.4 Failure may vary over a given area. Discretion must therefore he 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 he 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. 1, Fig. 2, and Fig. 3.
5.3 Estimate percentage of surface area rusted using the visual examples in Fig. 1, 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.ASTM D610 pdf download.