Electrochemical Corrosion Testing
The electrochemical corrosion test measures the corrosion behavior of materials in electrolytes by current-voltage measurements. It gives the passive current density and allows quick evaluation.
Physical-Chemical Mechanism of Action
The test uses an electrolyte in which the material sample pair (anode and cathode) is placed. By applying an electric field, the current density caused by corrosion is measured.
Metallurgical Relevance & Risks in Welding
This test helps in selecting materials with low corrosion susceptibility. Incorrect material selection can lead to accelerated corrosion and thus cracks and loss of strength.
Workshop Practice & Instructions
For the test, an electrolyte like hydrochloric acid is used. The samples are placed in the electrolyte for 24 hours, and the current density is measured every 15 minutes. A lower passive current density indicates lower corrosion susceptibility.