金属基体表面涂覆的非金属涂层可以提高基体的耐腐蚀、耐高温等性能，涂层的结合质量是涂层性能的重要指标。传统的超声透射和反射方法可以实现对涂层脱粘的检测，但是对于非脱粘涂层结合质量的检测较为困难。该文采用超声斜入射反射检测法，对不同结合质量的非金属涂层进行检测，利用频谱分析技术计算得到斜入射非线性系数。检测结果表明：斜入射非线性系数可以反映非金属涂层的结合质量，涂层的脱粘情况可以通过基频的幅值判断，而在非脱粘情况下，斜入射非线性系数越大，则涂层结合质量越差。
Non-metallic coatings on the surfaces of metal substrates can improve the corrosion resistance and high temperature performance of the substrates. The adhesion quality of the coatings is an important index for coating performance. Conventional ultrasonic transmission and reflection methods can detect coating de-bonding, but cannot easily detect the adhesion quality of the bonded coating. Non-metallic coatings with different adhesion qualities are evaluated using an oblique-incidence radiative method. The nonlinear coefficients of the oblique-incident wave are calculated using spectral analysis techniques. The results show that the nonlinear coefficients of the oblique-incident wave reflect the adhesion quality of the ceramic coatings. The bonding quality of the coating can then be evaluated by the amplitudes of the fundamental frequency. For a bonded coating, a greater nonlinear coefficient indicates worse adhesion quality.
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