Patent ID: 9212555
Filing Date: 2015-12-15
Classification: C23F,C23G,F01D

Abstract:
1. A method for removing a wear protection coating from a surface of a gas turbine component, the wear protection coating having at least one relatively hard ceramic layer and at least one relatively soft metallic layer, the method comprising: alternately positioning the gas turbine component in two different chemical baths for at least partially removing the wear protection coating from the gas turbine component without damaging the surface of the gas turbine component by removing a portion of the surface, a first bath being used exclusively for the removal of each relatively hard ceramic layer of the wear protection coating, and a second bath being used exclusively for the removal of each relatively soft metallic layer of the wear protection coating, the component being sequentially positioned in the respective first and second baths corresponding to the disposition of the at least one relatively hard ceramic layer and the at least one soft metallic layers on the component, wherein said first bath is an acid consisting of a hydrogen peroxide solution and at least one sodium salt and/or potassium salt of an organic acid contained therein, and wherein said first bath has a pH value between 3 and 5; and wherein said second bath is formed from a 5 w/v % to 50 w/v % alkali hydroxide solution.