Large-size titanium alloy structure micro-arc oxidation based on scanning cathode and verification method

Abstract

The invention discloses a large-size titanium alloy structure micro-arc oxidation based on scanning cathode and an experimental verification method thereof. Through theoretical design and experimentalresearch and other manners, a large-size titanium alloy structure surface one-time micro-arc oxidation technology is achieved, the key technologies of scanning cathode device design, one-time large-area micro-arc oxidation technical process regulation and control and the like are achieved, thereby solving the problems of micro-arc oxidation process and film surface quality of large-size structural parts and improving the capacity of one-time area treatment to be more than 4m<2>, the oxidation efficiency is greatly improved, and a foundation is laid for micro-arc oxidation treatment on the surfaces of light alloy large-sized parts, such as aluminum alloy, magnesium alloy and the like, and complex parts.

Description

technical field [0001] The invention belongs to the technical field of light metal surface treatment, and in particular relates to a scanning cathode-based micro-arc oxidation of a large-scale titanium alloy structure and a verification method. Background technique [0002] Micro-arc oxidation technology became an international research hotspot in the middle and late 1980s. Since the 1990s, countries such as the United States, Germany, Russia and Japan have accelerated the research and development of micro-arc oxidation technology, and have applied it in petroleum, textile, aerospace, weapons, Ships and other fields began to be applied. Since the introduction of micro-arc oxidation technology into China in the late 1990s, many domestic units have carried out research work one after another. The micro-arc oxidation film layer is a ceramic structure with a certain degree of brittleness. It is easy to produce microcracks under the interaction of external force and load, which ...

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Problems solved by technology

On the other hand, the research on the micro-arc oxidation process of large-scale structures and complex parts is immature. In actual work, only multiple micro-arc oxidation treatments can be used. Ablation and other defects, and lack of in-depth research on mechanical properties, so engineering applications have not yet been realized in the overall large wall panel structure

Although the China Special Aircraft Research Institute has carried out research on the micro-arc oxidation technology of aluminum alloy small parts and connectors in the sea-mounted project, and tracked the research progress of the micro-arc oxidation technology of large-scale structural parts, it has not yet solved the problem of large-scale segmented parts. Oxidation area limitation and surface defects such as ablation during oxidation

[0003] Although titanium alloy has good mechanical properties and anti-corrosion properties, it has poor wear resistance and is sensitive to some halide ions. It is generally treated by surface passivation when used, but it can be used in harsh marine environments, high-temperature environments or When used under the coupling conditions of wear resistance and anticorrosion, its performance index is far from meeting the demand, and the surface quality of titanium alloy is extremely high when used, and slight surface damage will also greatly reduce its corrosion resistance fatigue performance, especially It is applied to titanium alloys such as engine blades. Therefore, the process control of micro-arc oxidation treatment on the surface of titanium alloys is more complicated than that of aluminum alloys and magnesium alloys. It is the first in China to realize one-time micro-arc oxidation treatment of large-scale titanium alloy structures.

The maximum output average current of micro-arc oxidation power supply at home and abroad is about 500A, according to the oxidation current density of 2A / dm 2 According to calculation, the treatment area at one time is only 2.5m 2 , for large siding and other over 3m 2 None of the large-scale titanium alloy parts can be oxidized at one time

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