Anticorrosive method of inner cavity of sealable metal component with multi-cavity structure

Abstract

The invention provides an anticorrosive method of an inner cavity of a sealable metal component with a multi-cavity structure. The anticorrosive method comprises the following steps: cleaning the inner cavity of the sealable metal component with the multi-cavity structure, drying, and vacuumizing; charging nitrogen or an inert gas into the inner cavity, and plugging a gas hole of the sealable metal component with the multi-cavity structure by a stop valve; determining the pressure of the inner cavity of the sealable metal component with the multi-cavity structure after the nitrogen or the inert gas is charged; determining the pressure of the inner cavity of the treated sealable metal component with the multi-cavity structure during working, and comparing with the pressure of the inner cavity of the sealable metal component with the multi-cavity structure after the nitrogen or the inert gas is charged; if no change, showing that the inner cavity is well sealed; and if the pressure is lowered, supplementing the nitrogen or the inert gas into the inner cavity. According to the anticorrosive method provided by the invention, the interior of the inner cavity of the sealable metal component with the multi-cavity structure can be in the inert environment, a corrosion medium is isolated, further development of corrosion is inhibited, and the anticorrosion and maintenance costs can be lowered.

Description

technical field [0001] The invention relates to an anti-corrosion method, in particular to an anti-corrosion method for an inner cavity of a metal component with a sealable multi-cavity structure used by an aircraft, and belongs to the field of aviation chemical industry. Background technique [0002] Based on the consideration of special requirements for weight reduction and meeting functions, there are many slender inner cavity structures on the aircraft, such as the horizontal tail shaft, landing gear pillars, actuator rods, support walls, slide rails, etc., some of which are made of A closed cavity with a hollow structure, and these closed cavities have only one small hole to communicate with the external environment. During the service period of the aircraft, due to condensation and other phenomena caused by precipitation, humid air, alternating changes in temperature and pressure changes, the surface of the inner cavity is in a corrosive environment of alternating dry ...

AI Technical Summary

Problems solved by technology

[0008] 1. The coating method needs to clean the inner surface, otherwise it will affect the bonding force between the coating and the inner surface, and if there is corrosion on the inner surface before coating, the corrosion on the inner surface under the coating will continue to develop after coating , can not play the role of anti-corrosion;

[0009] 2. Usually in the surface treatment, "acid etching treatment cannot be used for steel parts with heat treatment strength greater than 1300MPa or parts that are easy to intercept solution

"The inner cavity structure cannot be cleaned by sand blowing, and there are corners;

[0010] 3. The coating method cannot meet the technical requirements for the thickness, uniformity and adhesion of the coating;

[0011] 4. There are certain corner positions in the multi-cavity structure. During the process of pouring paint, some corner positions cannot fully contact with the paint, and the method of pouring paint cannot guarantee the uniformity of coating thickness;

[0012] 5. The current method used to predict the corrosion of the inner cavity can only be obtained through the endoscope. This method is only suitable for parts with a single cavity. For multi-cavity parts, only the parts can be cut open to clearly know the cavity. Internal corrosion conditions, which are not operable;

[0013] 6. The surface of the inner cavity has been in a dry and wet corrosive environment for a long time. The anti-corrosion technology of the inner cavity is insufficient, and there are certain defects in the anti-corrosion coating. Some metal materials are sensitive to environmental corrosion, which leads to corrosion problems during the service period of the parts. , affecting the safety and stability of the aircraft, causing huge losses in manpower, material and financial resources

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