Carbon fiber composite materials have always been famous for their high specific strength and light weight. In addition, the corrosion resistance of this advanced composite material is also quite advantageous. Its high temperature resistance is greatly affected by the resin matrix. Below, this article will take carbon fiber The corrosion resistance and high temperature resistance of composite materials are analyzed in detail.
The corrosion resistance of composite materials mainly refers to the performance in the following environments:
Performance in high humidity environments, such as being immersed in liquids such as fresh water or sea water.
Performance in chemical media, such as acids, bases, salts, organic chemical reagents, etc.
Performance in a high temperature aerobic environment.
In the above environment, water and other media will infiltrate the composite material through the interfacial gap and have a series of physical and chemical interactions with it. The infiltration of other liquid media into the microcracks of the interface phase will cause them to expand, thereby generating internal stress at the interface between the fiber and the matrix, weakening the bonding force between the fiber and the matrix, and leading to a decrease in the strength and corrosion resistance of the composite material.
In addition, organic solvents such as acids, alkalis, and salts have a faster and more obvious impact on composite materials. When the chemical medium penetrates and diffuses into the carbon fiber composite material, a series of chemical reactions such as dissolution degradation and oxidation will occur. These chemical reactions will not only negatively affect the performance of the composite material, but also cause a series of changes on the surface, such as tarnishing, discoloration, blistering, cracking, and fiber exposure.
For carbon fiber composite materials, the carbon fiber, the resin matrix and the interface as the reinforcement, and the interaction between these three determine the actual performance of the carbon fiber composite material. Carbon fiber materials are not only strong and light, but also have good chemical stability. Except for strong acids such as nitric acid, water and general chemical media have little effect on them. Carbon fiber reinforced epoxy resin has a high degree of cross-linking and a large amount of Benzene ring, higher heat distortion temperature and better thermal stability, it still has excellent solvent resistance and alkali resistance at 260°C.
Of course, in addition to its own properties, the actual environment in which the composite material is applied, including the working temperature, the pressure, the nature and state of the medium in contact, and the time spent in such a working environment, will affect the carbon fiber composite material. The performance has a direct impact.
How to improve the corrosion resistance of carbon fiber composite materials?
Improve the process method, increase the degree of substrate curing, minimize the process defects such as microcracks and voids during the pressurization curing process, apply a waterproof coating on the surface, and avoid the exposure of the carbon fiber ends, etc., all of which help to achieve Actual corrosion resistance of carbon fiber parts.
How to improve the high temperature resistance of carbon fiber composite materials?
The general composite material first produces thermal expansion and a certain internal stress after the temperature rises. When the temperature rises further, the component materials of the composite material will gradually undergo a series of changes such as softening, melting, decomposition and even burning. , So that the mechanical properties of the composite material are drastically reduced. Generally speaking, the heat resistance of carbon fiber composite resin matrix is far inferior to that of reinforcement, so the heat resistance of carbon fiber reinforced resin matrix composite mainly depends on the heat resistance of its polymer matrix.
As a general thermosetting resin, epoxy resin has excellent processability, moldability and heat resistance. Generally, the glass transition temperature of epoxy resin is 130°C-140°C. In the natural environment, thermal factors have little effect on it. , But in the case of higher working temperature or more humidity, or even greater negative effects of chemical media, if carbon fiber composite materials want to maintain good performance stability, it is necessary to make better choices in the resin matrix. Zhishang New Materials uses continuous carbon fiber as the reinforcement according to actual application requirements, and uses high-end thermoplastic resins with better high temperature resistance, such as PEEK, PPS, TPI, PA6, etc., as the matrix material. Through the upgrade of the resin matrix, the carbon fiber composite parts are made The performance in terms of heat resistance, wear resistance and corrosion resistance meets higher-end application standards.
Wuxi Coreco is a professional carbon fiber product manufacturer and supplier. It uses high-quality raw materials and advanced technology to produce high-quality carbon fiber products according to customer needs. It has won unanimous praise from customers at home and abroad. For more inquiries about carbon fiber products, please contact US.
