Protective structure and protective method for copper and aluminum welding points

Abstract

The invention discloses a protective structure and a protective method for copper and aluminum welding points. The protective structure and the protective method are characterized in that a protective sleeve wraps the outer face of the copper and aluminum welding points of a copper tube and an aluminum tube; the protective sleeve has a dual-layer structure; the outer layer is made of a pyrocondensation material and the inner layer is made of a hot melting material. The protective sleeve wrapping the outer face of the copper and aluminum welding points of the copper tube and the aluminum tube can effectively block water vapor from approaching the cooper and aluminum welding points, and the generating conditions of electrochemical corrosion are cut off, so the copper and aluminum welding points are simply and effectively protected, the implementation is easy and the cost is low.

Description

technical field [0001] The invention relates to a protection structure and a protection method for preventing electrochemical corrosion of copper-aluminum solder joints. Background technique [0002] Copper tubes and aluminum tubes have been widely used in the evaporator of refrigerators and the connecting pipes of air conditioners, but these applications are often in humid environments with alternating cold and hot. Electrochemical corrosion is very prone to occur in the environment. [0003] At present, the copper-aluminum tube connection method of the evaporator is mainly "copper-aluminum resistance welding". During the welding process, the copper tube and the aluminum tube are respectively fixed on the electrodes, and the resistance heat generated by the current passing through the contact surface of the joint and the adjacent area is used for welding. . The chemical properties of the aluminum tube are very active, and a non-dense, non-conductive oxide layer is quickly...

AI Technical Summary

Problems solved by technology

[0004] The anti-corrosion design of the area around the copper-aluminum solder joint is the key to the reliability level of refrigerators and air conditioners. For the anti-corrosion design of the area around the copper-aluminum solder joint, electrostatic spraying, paint baking or quick-dry coating are usually used at present. The method of combining paint with PE heat shrinkable tube, but these methods are generally poor in manufacturability and prone to the defect of "paint film leakage"; and there is poor reliability and prone to paint film water seepage

In addition, these methods generally have the defects of low efficiency and high cost.

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