Molybdenum pitting resistance factor
The molybdenum pitting resistance factor shows how well molybdenum protects a steel alloy against chloride-induced pitting damage. A higher factor means better corrosion protection.
Physical-Chemical Mechanism of Action
Molybdenum improves the passivation layer stability of steels against chloride ions. It forms a dense, stabilized layer on the surface that prevents corrosion reactions.
Metallurgical Relevance & Welding Risks
A low molybdenum pitting resistance equivalent increases the risk of chloride-induced pitting damage. This can lead to cracks and loss of strength, especially in environmental corrosion situations.
Workshop Practice & Action Guidelines
Make sure the weld has sufficient molybdenum concentration. If it's missing or too low, pitting risk can increase. After welding, check the surface for corrosion and apply corrosion protection treatment if needed.