Preparation of steel substrates before application of paints and related products. Tests for the assessment of surface cleanliness. Extraction of soluble contaminants for analysis by acid extraction
25.220.10 - Surface preparation
This document specifies a method of extracting, for analysis,
acid soluble contaminants from a surface by use of flexible cells
in the form of adhesive patches or sleeves which can be attached to
any surface, regardless of its shape (flat or curved) and its
orientation (facing in any direction, including downwards).
The described method is suitable for use in the field to
determine the presence of acid soluble contaminants before painting
or a similar treatment.
This document does not cover the subsequent analysis of the
contaminants that have been dissolved off. Methods of analysis
suitable for field use are described in other parts of ISO 8502 such as ISO 8502-5.
This document is similar in procedure to, but not equal to, ISO 8502-6. The main difference
is the solvent used and the subsequent analysis that can be
performed on the extraction solution.
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