Standard

NS-EN ISO 8502-2:1999

Withdrawn

Note: This standard has a new edition: NS-EN ISO 8502-2:2017

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Abstract

This part of IS0 8502 describes a method for assessment of chloride-containing salts that are readily soluble in water and are present on a steel surface. The method is also applicable to previously coated surfaces. It is normally to be used in a laboratory using washings sampled from surfaces on site. The method is applicable to the assessment of salts that have been introduced by the cleaning pro- cedure, or that have deposited on the surface before or after the cleaning. NOTE 1 Although the procedure for chloride determination is generally accurate, the overall precision of the method is limited by uncertainties in the sampling procedure. In addition, traces of iron chloride at the bottom of pits are difficult to extract into the sample. The test method cannot be used on surfaces treated with chromate or nitrite, which are commonly used as inhibitors in the water when wet blast-cleaning. This is because a chromate concentration of 10 mg/l or greater or a nitrite concentration of 20 mg/l or greater in the wash water interferes with the determination of the chloride. An iron(lll) ion concentration of 10 mg/l also interferes with the determination, but the iron(lll) ions are concentrated in the rust deposits, which are removed from the test solution by filtration.

Document information

  • Standard from SN
  • Published:
  • Withdrawn:
  • Edition: 1
  • Version: 1
  • Document type: NAT
  • ICS 25.220.10
  • ICS 87.020
  • National Committee SN/K 51

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