Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces
ASTM D610 enables us to assess the degree of rusting of a painted steel surface through the use of the visual aid that is provided by this method. Indeed, this practice corresponds to a standardized way which allows to evaluate the amount and the distribution of visible surface corrosion on a coated surface. More specifically, ASTM D610 was created as a means to qualify homogeneously the level of corrosion observed on aged samples. Hence, ASTM D610 has to be used with methods of the likes of ASTM B117 , ASTM D714 and ASTM G85 . Micom Laboratories offers the ASTM D610 test as part of its corrosion testing services .
ASTM D610 uses and factors to consider
Evaluation of the degree of rusting of painted steel surface
The goal of ASTM D610 is to provide a standardized means to evaluate the degree of rusting of painted surfaces with the aid of visual examples. Indeed, the photographs that are issued by this method are categorized by a 0 to 10 scale in function of the percentage of the rusted surface that is visible and by the distribution of the rust. In fact, a lower grade corresponds to a large corroded surface while a high grade is associated with a small rusted surface. Moreover, by assessing the amount of rust that is beneath or through a paint film, it is possible to determine if the coating system ought to be replaced or repaired, because it is a great indicator of the remaining lifetime of the latter.
The main factors that are in play when conducting this test protocol are: the classification of the rust distribution and the degree of rusting.
ASTM D610 rating corrosion
Rating corrosion by ASTM D610 is twofold: the degree of rusting and the rust distribution. The rating is listed in table 1.
Table I: Specifications of the corrosion rating
|Degree of rusting||0||> 50%|
|1||> 33.0% and ≤ 50.0%|
|2||> 16.0% and ≤ 33.0%|
|3||> 10.0% and ≤ 16.0%|
|4||> 3.0% and ≤ 10.0%|
|5||> 1.0% and ≤ 3.0%|
|6||> 0.3% and ≤ 1.0%|
|7||> 0.1% and ≤ 0.3%|
|8||> 0.03% and ≤ 0.1%|
|9||> 0.01% and ≤ 0.03%|
|Classification of the rust distribution||Spot rust||The rusting is condensed in a few localized areas of the painted surface.|
|General rust||The rusting is randomly distributed in sizes and in areas throughout the painted surface.|
|Pinpoint||The rusting is spread through the surface as small individual specks of rust.|
|Hybrid||The rusting combines attributes of at least two of the previous classification.|
Other test methods related to ASTM D610
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