Abstract
The magnetic powder method occupies one of the leading positions in the system of non-destructive quality control of materials. Approximately 80% of the controlled ferromagnetic products are controlled by the magnetic powder control method. The high sensitivity of the control method, its versatility, relatively low labor intensity of control, and the visibility of the results ensured that the method was widely used in industry. The main factors, characteristics and parameters of magnetic powder suspensions affecting the sensitivity of magnetic powder control are considered. A comparative analysis of the sensitivity of experimental suspensions in terms of the effectiveness of detecting artificial surface and subsurface defects of the MO-1 control sample was carried out. The qualitative efficacy of magnetic powders of the "Diagma" and "Crocus" type as a basis for the manufacture of the suspensions is clearly demonstrated, and the effect of autocoagulation on the sensitivity and reliability of the results of magnetic powder control is shown on the example of "Diagma-1100" and "Diagma-1200" powders. The verification of the effectiveness of the suspensions based on ferromagnetic particles γ-Fe₂O₃ and Fe₃O₄ in suspended state did not show their qualitative advantages in comparison with the other experimental suspensions. The further direction of the development of this work is to check the operability of experimental magnetic suspensions γ-Fe₂O₃ and Fe₃O₄ that are not in a suspended state. It is suggested that this state of magnetic suspensions γ-Fe₂O₃ and Fe₃O₄ negatively affects the attraction of magnetic particles by inhomogeneous magnetic fields, and also does not allow a clear indication pattern to form over the defects. In addition, the task of selecting the optimal concentration of magnetic particles in the finished magnetic suspension, in which a high degree of sensitivity to defects will be achieved with the minimum possible consumption of materials included in the magnetic suspension, can be considered as the next stage of the research. English version of the article is available at URL: https://panor.ru/articles/influence-of-various-factors-on-the-sensitivity-of-magnetic-particle-inspection/77764.html
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