Abstract

This document specifies a method for determining the condition of the passive layer by means of a color change using a KorroPad®, which is based on the detection of iron ions using an indicator solution. The KorroPad® method is suitable for comparative testing of stainless steel surfaces with regard to their passive layer formation. It can be used to test surfaces on which the passive layer has formed automatically under atmospheric conditions after the manufacturing or processing process, as well as surfaces on which the passivation has been supported by specific post-treatment measures (e.g. pickling and passivation). The test method is primarily surface-specific and has been extensively tested for all common stainless steels with an effective sum of 18 to 26. For steel grades with deviating effective sums, it must be checked whether the KorroPad® composition needs to be adjusted.

Begin

2023-10-26

Planned document number

DIN 50024

Project number

06236446

Responsible national committee

NA 062-01-77 AA - Corrosion testing  

draft standard

Corrosion of metals and alloys - Test method using a color indicator - Test method for the detection of passive layer formation on stainless steels
2025-01
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