High-Temperature Corrosion
High-temperature corrosion is a chemical reaction between metal and gas at high temperatures that forms scale or sulfide layers. It leads to material loss and can damage the material.
Physical-chemical mechanism
In high-temperature corrosion, the metal reacts with gases like oxygen or sulfur dioxide at elevated temperatures. This leads to chemical exchange, forming scale or sulfide layers. Reactions are often catalyzed and can proceed faster than at normal temperature.
Metallurgical relevance & welding risks
High-temperature corrosion can cause material loss and damage to the structure. It is especially likely in weld zones where temperatures are high and gases are present. This can lead to cracking or reduced strength.
Workshop practice & instructions
To avoid high-temperature corrosion, control and reduce temperatures during welding. Use suitable shielding or insulation to protect the metal from gases. At high temperatures, it's crucial to ensure a clean weld to minimize corrosion products.