Electrochemical measurements

Your products include:

  • Combinations of 'noble' and 'non-noble' materials?
  • Weld seams at risk from corrosion?
  • Coatings and anti-corrosion protection systems?

Our range of services comprises, among other things, testing of resistance to pitting corrosion, such as, for example, the determination of the critical pitting corrosion temperature ("Critical Pitting Temperature", CPT) in accordance with ASTM G150, the Fuhrmann test in accordance with GS97017 and DIN 53100 and the following test variations in addition:

Corrosion Potential

The free corrosion potential of metallic materials gives the first information concerning the susceptibility to corrosion of metallic materials and potential differences in material combinations (galvanic corrosion). These change through ambient effects can be detected by the taking up of the free corrosion potential over longer periods.

The free corrosion potential can be determined, among other ways, in accordance with the standards DIN 50918 and DIN 50900.

Current Density Potential

The corrosion behaviour of materials in solutions can be characterized with the aid of current density potential graphs. Among other things, it is possible to make statements on the reaction kinetics, the possibility of forming a passive layer, and the potential for pitting corrosion.

The determination is done in accordance with standards DIN 50918, DIN 50900 and ISO 15158.

Potentiostatic Polarisation

For example, passive coat properties can be determined through a constant polarisation and the cathodic disbonding of coatings also determined. A further application is potientiostatic polarisation with the continuous increasing of the temperature of the electrolytes to determine the critical pitting temperature. 

DIN EN ISO 15711
Paints and varnishes - Determination of resistance to cathodic disbonding of coatings exposed to sea water

DIN EN ISO 17864
Corrosion of metals and alloys - Determination of the critical pitting temperature under potientiostatic control

ASTM G150

Electrochemical Critical Pitting Temperature Testing of Stainless Steels

SEMI F77
Test method for electrochemical critical Pitting Temperature Testing of alloy surfaces used in corrosive gas systems

EIS - Electrochemical Impedance Spectroscopy

Using this method, complex reaction processes in corrosion and electrochemistry can be investigated at a fundamental level. It is possible to make statements on both the reaction kinetics and also the substance transport mechanisms. In addition, electrochemical impedance spectroscopy finds application in the determination of polarization resistances, layer capacitances and layer integrity in coatings.