What indicates a pitted appearance on a compressor blade?

A pitted appearance on a compressor blade is indicative of corrosion. Corrosion occurs when the metal surface interacts with moisture and other corrosive agents, leading to the formation of small pits or cavities on the surface of the material. This deterioration is particularly problematic in gas turbine engines, as it can weaken the structural integrity of the blades and negatively impact their aerodynamic efficiency.

In the context of gas turbine engines, compressor blades are often subjected to harsh operating conditions that can contribute to corrosion, including exposure to high temperatures and aggressive working fluids. The presence of pits can create stress concentrations that may lead to further degradation over time, making it essential to monitor and address any signs of corrosion during maintenance inspections.

Understanding the nature of corrosion and its effects on compressor blades is crucial for ensuring the reliability and performance of gas turbine engines.