Electrospark deposition process for oxidation resistant coating of cooling hole

A turbine engine component of a metal frame substrate including cooling holes, wherein at least one of the cooling holes comprises a rounded edge with a coating adjacent a first surface, wherein the rounded edge with the oxidation resistant coating is applied using a method for providing the coating, comprising:

• providing the substrate having the first surface and the at least one cooling hole;
• providing a portable coating device including:
• electro-spark deposition (ESD) equipment, and
• an ESD torch electrically connected with the ESD equipment, the ESD torch including:
• an inert gas source;
• and
• a rotary electrode including a conductive material, the rotary electrode disposed within the ESD torch, the rotary electrode shielded by an inert gas, wherein rotary electrode applies a compositionally controlled protective coating to the first surface of the substrate;
• inserting the rotary electrode at least partially into the at least one cooling hole;
• generating an electrospark between the rotary ESD electrode and the substrate to only form the rounded edge as a result of deformation of material from the substrate at an edge of the cooling hole and deposit a coating of electrode material alloy having a thickness of 3 mils or less over the rounded edge.