With the wide application and concern of carbon fiber in recent years, the application of carbon fiber composite materials to metal has also been widely spread, but along with it has brought some problems. Corrosion of carbon fiber and metal joints is more common, which is due to the nature of the carbon fiber. Next to introduce this one of the reasons and carbon fiber and metal connections at the anti-corrosion process.
The resistivity of carbon fiber is 2.5 * 10 ^ -3, electrochemical performance close to heavy metals, and the composite material and most of the alloy between the larger potential difference, so the metal and carbon fiber in direct contact with the environment, it will not Difficult to understand the carbon fiber and metal connections at the problem of easy corrosion. So how can we avoid such a situation? Electrochemical corrosion must have the following three conditions, anti-corrosion measures are precisely from these three aspects:
1, eliminate or reduce the potential difference.
The potential difference between the aluminum alloy and the carbon fiber composite material is large, and the potential difference between the titanium alloy and the carbon fiber composite material is small. Therefore, in the carbon fiber composite material connection, the titanium alloy is used to manufacture the joint fastener, thereby reducing the occurrence of electrochemical corrosion. Coupled with the titanium alloy light weight, high strength, it becomes the most commonly used carbon fiber composite fasteners connecting materials. Worth reminding everyone is that when using titanium fasteners to connect carbon fiber composite materials and metals, you need to first carbon fiber joints at the surface treatment, different methods, anodizing, phosphating and vacuum ion plating aluminum.
2, to avoid direct contact with carbon fiber and metal parts.
When the carbon fiber composite material and metal materials are connected, the overlap or docking parts of the shop before laying a glass lining or Kevlar cloth, using this method can effectively separate the metal and carbon fiber to prevent joint corrosion. In addition, the sealant is used to seal the cut surface of the carbon fiber composite material. The carbon fiber and the metal can also be separated to a certain degree. In addition, anodizing the aluminum alloy and the anti-corrosion treatment such as painting can all receive good results.
3, to prevent the formation of electrolyte environment.
For permanent joints, the entire joint is often encapsulated with resin to prevent intrusion of the electrolyte by gluing the fasteners, wet fitting, butting or overlapping, and the exposed parts of the fasteners, plus Glass cloth or pure titanium washer, and then the entire assembly part of the glue, co-curing, so the joint is formed to prevent both metal and carbon contact, but also completely sealed. Common sealants are epoxy – polyamide resin, polysulfide sealants and so on.
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