Inconel high-temperature oxidation
Inconel high-temperature oxidation is the oxidation behavior of nickel-chromium alloys at high temperatures. A dense chromium oxide layer forms, preventing oxygen ingress and metal degradation.
Physicochemical mechanism of action
At high temperatures, the nickel-chromium material reacts with oxygen, forming chromium oxide. These oxides form a dense layer on the metal surface, preventing further contact with oxygen and protecting the metal from further degradation.
Metallurgical relevance & welding risks
High-temperature oxidation can lead to cracks or distortion in poor welding procedures. The oxide layer must be carefully removed to establish a sound joint. Failure to remove oxides can lead to failed weld attempts and low strength of the weld seam.
Workshop practice & instructions
Before Inconel welding begins, the oxide layer must be carefully removed. This can be done by chemical pickling agents or mechanical polishing methods. Temperatures during welding must be accurately maintained to ensure a homogeneous joint. At high temperatures, oxidation can accelerate, so continuous monitoring and control of the environment is necessary.