High-strength polymer composites are widely used in the aerospace, automotive, and marine industries due to their high strength and low weight. However, exposure to aggressive environments such as salt fog, acidic solutions, and high humidity can lead to corrosion of the matrix and fiber-matrix interface. This study analyzes the effect of fiber surface treatment on the corrosion resistance of composites. Tests were conducted using silane and phosphate treatments, as well as corrosion resistance assessment using immersion testing and potentiodynamic polarization. The results demonstrate that fiber surface treatment significantly reduces corrosion damage and improves matrix adhesion, thereby extending the service life of the composites.

polymer composites, fibers, surface treatment, corrosion resistance, adhesion

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