BS ISO 8502-15-2020 Preparation of steel substrates before application of paints and related products一Tests for the assessment of surface cleanliness Part 15: Extraction of soluble contaminants for analysis by acid extraction.
62.7 Transfer the solvent to a suitable vessel for analysis (see as required for the analysis method
6.2.8 I)unng steps 62.3 to 6.2.7. it is essential that no solvent be lost From the cell or syringe, due for instance to inferior-quality materials or improper handling of the materiaLs. II any solvent is lost, the solution obtained shall be rejected.
62.9 On complelaon ol step 6.2.2. clean and rinse the synnge so that It can be reused. A bent needle Is best left as it is until it becomes necessary to straighten it or bend it further.
6.3 ExtractIon by sleeve by pie-tilling
6.3.1 Take an adhesive sleeve (5.1) of a suitable raze (see Tablel)- Remove the protective paper and straighten the sleeve.
6.32 Pretill the sleeve with the required volume of solvent (5,3) and adhere the patch to the surface without loss of solvent (see ltgure 7).
NOTE The volume of solveM needed to fill the sleeve compartment is proportional to the compartment area and normally amounts to 10.0 lOt mi/mm2 t0,6 103 mi/mmZ.
6.3.3 Position the sleeve such that all solvent In the sleeve Is in contact with the surface.
6.3.4 L)urtng a suitable period of time, to be agreed between interested parties, or recommended by the nlanubcturL’r of the test equipment, agitate the sleeve sevrrl times by massaging the solvent on the surface. After the time period, let the sleeve hang down in order for the solvent to flow into the compartment of the sleeve
6.3.5 Cat-c lully remove the sleeve from [he surface. Retain the solvent fur further analysis.
6.3.6 DurIng steps 6.22 to 6.15. It Is essential that no solvent be lost from the sleeve, due for instance to Inlertor-quality materials or improper handling of the matetials If any solvent is lost, the solution obtained shall be rejected.
6.3.7 Record the temperature of the steel surface to the nearest 0.5°C using the contact thermometer (5,4). The temperature shall be over 0 C to avoid Ice on the surface.
6.4 Blank test
To check cleanliness of the cells, blank tests shall be performed in advance For each batch.
For the blank test, a pue of clean glass, to which the adhesive patch will adhere, shall be used and water of the same type as to be used for testing. The same procedure as in 62 or 62 shall be followed. lithe background interference Is significant th cause shall be investigated and, ii possible, eliminated.
If the background interference introduced by the adhesive cell is significant, reproducible and cannot be eliminated, a blank test shall be performed in parallel to cch test and the background subtracted from the field quantitative measurements in order to report a net surface contamination value If this procedure is followed, it shall he stated in the report.BS ISO 8502-15 pdf download.