钢结构在潮湿、存水和酸碱盐腐蚀性环境中容易生锈，锈蚀导致钢材截面削弱，承载力下降。钢材的锈蚀程度可由其截面厚度的变化来反应。检测钢材厚度（必须先除锈)）的仪器有超声波测厚仪（声速设定、耦合剂）和游标卡尺。

 

     超声波测厚仪采用脉冲反射波法。超声波从一种均匀介质向另一种介质传播时，在界面会发生反射，测厚仪可测出探头自发出超声波至收到界面反射回波的时间。超声波在各种钢材中的传播速度已知，或通过实测确定，由波速和传播时间测算出钢材的厚度，对于数字超声波测厚仪，厚度值会直接显示在显示屏上。

 

The steel structure is easy to rust in the humid, stored water and acid alkali salt corrosion environment, the corrosion causes the steel section to weaken, the bearing capacity drops. The corrosion degree of steel can be changed by the change of the thickness of the steel. Detecting the thickness of steel (must) rust) instrument with ultrasonic thickness meter (velocity setting, coupling agent and vernier caliper).

Pulse reflection wave method is used in ultrasonic thickness gauge. When the ultrasonic wave is transmitted from a homogeneous medium to another medium, the reflection can occur at the interface, and the probe can measure the time of the ultrasonic wave to receive the reflected echo from the interface. The speed of propagation of ultrasonic waves in various steels is known, or the thickness of steel is measured by the wave velocity and propagation time.

 

 

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