Method for electrochemically removing MCrAlY coating
An electrochemical and coating technology, applied in the field of high-temperature protective coating surface treatment, to achieve the effect of low cost, thorough and clean coating removal, and easy operation
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Embodiment 1
[0029] In this example, the coating will be prepared on the substrate, and then the coating will be stripped electrochemically after the service simulation.
[0030] First, a NiCoCrAlY coating is prepared on a nickel-based superalloy K38G substrate:
[0031] (1) Cut the nickel-based superalloy K38G plate into 10×15×3mm rectangular parallelepiped samples using wire electric discharge cutting equipment, and cut a round hole with a diameter of about 1.7mm on the edge of each sample;
[0032] (2) Grind the cut sample with 120#, 240#, 400# sandpaper in sequence, and perform 200-mesh glass sand blasting treatment. The sample after sandblasting was ultrasonically cleaned in a solution of acetone and alcohol for 10 minutes, and the oil stain on the surface was removed for later use;
[0033] (3) Put the sample into the vacuum chamber of multi-arc ion plating, close the furnace door, and vacuum the back to 7.0×10 -3 Below Pa (this example is 5×10 -3 Pa), using a bias voltage to bomb...
Embodiment 2
[0042] In this example, the coating will be recoated over the decoated samples.
[0043] Prepare a NiCoCrAlY coating on the nickel-based superalloy K38G substrate, and remove the coating after oxidation in a muffle furnace at 1000 ° C for 100 h. The specific operation method is the same as in Example 1, and then recoat the NiCoCrAlY coating. The specific method is as follows :
[0044] (1) ultrasonically clean the sample after sandblasting in a solution of acetone and alcohol for 10 minutes to remove surface oil stains and set aside;
[0045] (2) Put the sample into the vacuum chamber of multi-arc ion plating, close the furnace door, and vacuum the back to 7×10 -3 Below Pa (this example is 3×10 -3 Pa), using a bias voltage to bombard the surface of the substrate with ions to remove residual attachments on the surface, and the bombardment time is about 20 minutes. Then use the alloy target to deposit the NiCoCrAlY coating, the argon bias is 0.2Pa, and the deposition time is ...
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