KorroPad - New Test Method for the Investigation of the Passive Layer Stability of Stainless Steels
- The KorroPad is a gel-based indicator test designed for the electrochemical determination of the passive layer stability and localization of surfaces of stainless steels threatened by localized corrosion. Different investigations and studies on the performance of the KorroPad as well as field trials by industrial users the have proven the principal suitability of the KorroPad method to assess the passive layer stability of stainless steels. The electrochemical mode of action will be described in detail and also the limitations of the applicability will be demonstrated. The influence of different surface finishes has been investigated and verified by known methods for describing corrosion resistances. As a result, the increased corrosion susceptibility of two ground surfaces has been detected, but also the corrosion resistance of further surface finishes could be confirmed. Furthermore the KorroPad test was used for the investigation of the influence of time and humidity onThe KorroPad is a gel-based indicator test designed for the electrochemical determination of the passive layer stability and localization of surfaces of stainless steels threatened by localized corrosion. Different investigations and studies on the performance of the KorroPad as well as field trials by industrial users the have proven the principal suitability of the KorroPad method to assess the passive layer stability of stainless steels. The electrochemical mode of action will be described in detail and also the limitations of the applicability will be demonstrated. The influence of different surface finishes has been investigated and verified by known methods for describing corrosion resistances. As a result, the increased corrosion susceptibility of two ground surfaces has been detected, but also the corrosion resistance of further surface finishes could be confirmed. Furthermore the KorroPad test was used for the investigation of the influence of time and humidity on the passive layer development on different stainless steels.…