Pitting potential
Pitting potential is the electrochemical potential above which the passive layer on a metal surface breaks down and pitting starts. A higher potential increases resistance.
Physikalisch-chemischer Wirkmechanismus
The pitting potential describes the electrochemical potential at which the passive layer on a metal surface is breached. This leads to localized pitting and can cause corrosion.
Metallurgical Relevance & Welding Risks
A low pitting potential increases the risk of corrosion and pitting, especially in humid environments. This can lead to cracks and loss of mechanical properties.
Werkstattpraxis & Handlungsanweisungen
To increase the pitting potential and improve resistance, the following measures should be taken:
• Use passivating welding agents or coatings.
• Keep the weld seam dry and protect it from moisture.
• Choose suitable protective agents to increase the pitting potential.