Metal surface aluminide coating removing liquid and preparation method and application method thereof
A technology of metal surface and application method, which is applied in the field of removing liquid for aluminide coating on metal surface and its preparation field, can solve the problems of deformation of parts, out of tolerance of parts, etc., achieves simple process, reduced repair cost, and strong operability Effect
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[0020] The second aspect of the present invention provides a kind of preparation method of the removal liquid of aluminide coating on the metal surface, the preparation method comprises: uniformly mixing nitric acid, sulfamic acid, water and optional copper sulfate and ferric chloride to obtain the removal solution.
[0021] According to the present invention, preferably, the preparation method comprises: putting half of the amount of water into the tank, then slowly adding nitric acid, sulfamic acid, the remaining water, and optional iron chloride and copper sulfate, and mixing uniformly to obtain the obtained the removal solution.
[0022] The third aspect of the present invention provides a method for applying the above-mentioned removal solution of the aluminide coating on the metal surface, the application method comprising: immersing the part in the removal solution, heating and soaking.
[0023] As a preferred solution, before removing the surface coating of the parts,...
Embodiment 1
[0034] This embodiment provides a removal solution for the aluminide coating on the metal surface, based on the total weight of the removal solution, the removal solution includes: 22wt% nitric acid, 2wt% ferric chloride, 22wt% sulfamic acid, 2wt% copper sulfate, The balance is water.
[0035] The specific preparation method is to first add half of the required volume of water into the tank, then slowly add the calculated amount of nitric acid, ferric chloride, sulfamic acid, copper sulfate and water, and keep stirring to mix evenly to obtain liquid.
[0036] The base material of the part to be decoated is DD5 single crystal superalloy, and the surface is coated with an aluminide coating.
[0037] Specific work: First, use the thermal coloring method to determine whether there is an aluminide coating on the surface of the part: remove the oil on the surface of the part, then dry sandblasting, and put the dry sandblasting part into a thermal cycle furnace at 600 ° C for 40 min...
Embodiment 2
[0043] This embodiment provides a solution for removing an aluminide coating on a metal surface. Based on the total weight of the removing solution, the removing solution includes: 27wt% nitric acid, 27wt% sulfamic acid, and water as the balance.
[0044] The specific preparation method is to first add half of the required volume of water into the tank, then slowly add the calculated amount of nitric acid, sulfamic acid and water, and keep stirring to mix evenly to obtain the removal solution.
[0045] The base material of the part to be decoated is MarM247 superalloy, and the surface is coated with an aluminide coating.
[0046] Specific work: First, use the thermal coloring method to determine whether there is an aluminide coating on the surface of the part: remove the oil on the surface of the part, then dry sandblasting, and put the dry sandblasting part into a thermal cycle furnace at 600 ° C for 40 minutes , take out the part to cool and check, the surface of the part is...
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