Easy to use Analyzers for Reliable Corrosion Measurements

Corrosion is a natural process that results in the gradual destruction of metals through a chemical reaction with their environment. The World Corrosion Organization estimates that the total annual cost of corrosion can be as high as 3 –3.5 % of a country’s GDP. This unavoidable deterioration of material is a costly problem and billions of dollars are spent each year to control, monitor and prevent corrosion processes.

Reliable Corrosion Measurements via Electrochemistry

Over the past three decades, several methods have been introduced to measure and monitor corrosion. While many of these traditional methods such as weight loss or spray test analysis are quick and cost-effective, they can only offer a qualitative overview of the process. In comparison, electrochemistry techniques are accurate, reproducible and often the only method to measure corrosion rates on a quantitative basis. Electrochemistry has not only made it easy and direct to measure the parameters governing the corrosion processes but has also helped greatly in the overall development of the novel corrosion resistant films and corrosion inhibitors.

Depending on the nature of the application, different electrochemical techniques are needed to determine specific parameters of interest. Metrohm also offers fully customized corrosion analyzers to evaluate corrosion parameters for specific ASTM methods. A corrosion software package with pre-programmed protocols is provided with every analyzer at no charge. Corrosion parameters of interest and the relevant ASTM methods are summarized in the table below. Metrohm instruments and pre-programmed methods provide ready-to-use tools to determine these parameters.

Electrochemistry TechniquesParameters of InterestASTM Reference Methods
DC Techniques
• Linear sweep voltammetry
• Tafel slope analysis
• Potentio-dynamic polarization (LPR)
• Polarization Resistance (Rp)
• Corrosion Rate (mm/Year)
• Corrosion Current
• Corrosion Potential
• ASTM G102-89 (2015)
• ASTM G59-97 (2014)
AC Techniques
• Electrochemical impedance analysis (EIS)
• Film Resistance & Conductivity
• Charge-transfer resistance
• Solution Resistance
• Polarization Resistance
• ASTM G59-97 (2014)
• ASTM G106-89 (2015)
Chrono & other Techniques
• Electrochemical noise (ECN)
• Critical pitting technique (CPT)
• Hydrogen Permeation study
• Cyclic polarization
• Hydrodynamic linear sweep
• Redox Kinetics
• Pit initiation
• Crevice progression
• Hydrogen resistance
• Surface morphology
• ASTM G150-99 (2010)
• ASTM G148-97 (2003)
• ASTM G100-89 (2015)
• ASTM G61-86 (2014)
• ASTM F746-04 (2014)
• ASTM F2129-15