Hot gas corrosion
Hot gas corrosion is oxidation or sulfidation of metals in hot gases, as found in turbines. It leads to material degradation and surface damage.
Physico-chemical mechanism of action
Hot gas corrosion occurs by direct contact of metals with hot gases containing oxygen or sulfur. Temperatures are high enough to allow a chemical reaction between the metal and the gases.
Metallurgical relevance & welding risks
This corrosion causes material degradation and surface damage. It reduces strength and service life of materials, especially in turbines and other high-temperature applications. Incorrect welding methods can worsen or accelerate corrosion.
Workshop practice & procedure
Use high-quality protective coatings and insulation to minimize contact with hot gases. Ensure the metal is clean before welding and avoid overheated tools that could damage the metal. If needed, use a corrosion-resistant welding alloy.