The effect of the addition of multi-scale ceramic particles(MSCP)on the wet corrosion resis-tance of QT400-18L castings was discussed.By observing and testing the surface morphology,corrosion products and corrosion rate of the samples under different humidities,it was found that most of the cor-rosion products were gathered around the graphite and were in the shape of double"rings".There is a trend inflection point on the corrosion rate curve that corresponds to a humidity value.Below this hu-midity,the addition of MSCP has no great effect on the corrosion rate of the sample;Above this hu-midity,the corrosion rate of the specimen with MSCP is reduced.Multi-scale ceramic particles(MSCP)can effectively improve the atmospheric corrosion resistance of ductile iron,mainly because of the in-crease in the amount of ferrite in the tissue,the improvement of graphite refinement and nodularization grade.
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