What is the effect of high humidity on the MPI process?

High humidity can significantly affect the magnetic particle inspection (MPI) process by influencing particle distribution and potentially leading to poor inspection results. In conditions of high humidity, moisture can interfere with the adherence of magnetic particles to imperfections on the surface of the test material. This can result in a less uniform distribution of particles, making it more difficult to identify accurately the indications of defects, such as cracks or voids. When the magnetic particles do not adhere properly or are washed away by moisture, the likelihood of missing critical defects increases, leading to an unreliable inspection outcome. Therefore, it's crucial to manage humidity levels in the environment where MPI is conducted to ensure the effectiveness and reliability of the inspection process.