Chemical pickling solution for removing surface oxide layer of high-temperature alloys containing elements Cr and Al and application of chemical pickling solution

A high-temperature alloy and surface oxidation technology, which is applied in the field of high-temperature alloy chemical method to remove oxide layer, to achieve high safety, bright surface and obvious effect

Active Publication Date: 2015-03-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, when preparing pickling liquid, especially when using sulfuric acid, there is a risk of a large amount of exothermic heat, and the use of hexamethylenetetramine increases the risk of flammability, sensitization and explosive reactants

Method used

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  • Chemical pickling solution for removing surface oxide layer of high-temperature alloys containing elements Cr and Al and application of chemical pickling solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] like figure 1 As shown, there is an oxide layer on the surface of the nickel-based superalloy IN 718 heat-treated test piece. This embodiment is for the pickling of the nickel-based superalloy IN 718 heat-treated test piece.

[0041] Using plastic fixtures, put the IN 718 alloy test piece after solid solution at 980°C for 10 hours directly into the container containing the pickling solution for pickling. The pickling solution is composed of: 350g / L hydrochloric acid, 410g / L nitric acid and 130g / L hydrogen peroxide, and the rest is water. The container is immersed in a constant temperature tank cooled by circulating water to ensure that the temperature of the pickling solution is lower than 30°C (generally 5°C to 20°C) during the pickling process, and vibrated in the pickling solution for 10 minutes. After the end, quickly move the test piece to the ethanol solution with a concentration of 99wt% for ultrasonic cleaning for 3 minutes, and then blow dry after washing.

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Abstract

The invention relates to a chemical pickling solution for removing surface oxide layers of high-temperature alloys containing elements Cr and Al and application of the chemical pickling solution and belongs to the process field of removal of oxide layers of high-temperature alloys by using a chemical method. The pickling solution is prepared from the following components: 300-400g/L of hydrochloric acid, 400-450g/L of nitric acid and 100-150g/L of hydrogen peroxide and the balance of water. Aiming at the high-temperature alloy work-pieces of which the nickel base, iron base and cobalt base contain Cr and Al, the surface oxide layers are removed through the synergism of hydrochloric acid, nitric acid and hydrogen peroxide in specific concentration, the action mechanisms of above components are as follows: hydrochloric acid and nitric acid are used as base reactants to react with the surface oxide of a high-temperature alloy, and the hydrogen peroxide is used as a catalyst to accelerate the generation of the reaction. The chemical pickling solution provided by the invention is obvious in pickling effect and high in efficiency, the treated high-temperature alloy has a bright and uniform surface; the pickling solution is low in heat release in the matching process, no inflammable, sensitizing and explosive reactant is generated, and the security is high.

Description

technical field [0001] The invention relates to a chemical pickling liquid for removing a surface oxide layer of a superalloy containing Cr and Al elements and its application, and belongs to the technical field of removing an oxide layer by a chemical method of a superalloy. Background technique [0002] In nickel-based, iron-based and cobalt-based superalloys, in order to improve the oxidation resistance and corrosion resistance of the alloy, a certain amount of Cr element is often added to the alloy to form a good adhesion and dense Cr 2 o 3 type oxide film. At the same time, solid solution and precipitation strengthening elements Ni, Al, etc. of the alloy will also form NiO, Al 2 o 3 Oxide film. The complex alloying elements make the superalloy oxide film have the characteristics of multi-layer and multi-phase, and the outer layer is composed of Cr 2 o 3 Mainly, the inner layer is Al 2 o 3 Mainly. Although this greatly improves the oxidation resistance and corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10
CPCC23G1/10
Inventor 程明张士宏叶能永宋鸿武
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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