Methods for producing a high temperature oxidation resistant coating on superalloy substrates and the coated superalloy substrates thereby produced

A method for producing a high temperature oxidation resistant coating on a superalloy component, the method comprising the steps of:

• selecting the superalloy component to be coated;
• forming or selecting an ionic liquid aluminum plating bath comprising an ionic liquid having a melting point less than 100° C. and an aluminum salt;
• electroplating at least one surface of the superalloy component under electroplating conditions in the ionic liquid aluminum plating bath to form a plated component;
• heating the plated component in a first heat treating step to a first temperature in a first temperature range of 600° C. to 650° C. and holding at the first temperature for about 15 minutes to about 45 minutes;
• and then
• heating the plated component in a second heat treating step to a second temperature in a second temperature range of 700° C. to 1050° C. for about 0.50 hours to about two hours or in a second temperature range of 750° C. to 900° C. for about 12 to about 20 hours.

A method for producing a high temperature oxidation resistant coating on a superalloy component, the method comprising the steps of:

• applying aluminum or an aluminum alloy to at least one surface of the superalloy component by electroplating at electroplating conditions in an ionic liquid aluminum plating bath comprising an ionic liquid that has a melting temperature less than 100° C. and an aluminum salt, the ionic liquid aluminum plating bath including a chloride, thereby forming a plated component with a chloride scale resulting from the chloride in the ionic liquid aluminum plating bath;
• substantially removing the chloride scale from the plated component;
• and
• then heat treating the plated component in a first heat treating step at a first temperature of 600 to 650° C. for about 15 to about 45 minutes and then further heat treating the plated component in a second heat treating step at a second temperature of 700° C. to 1050° C. for about 0.50 hours to about two hours or 750° C. to 900° C. for about 12 to about 20 hours.