Corrosion Behavior of SiMo Cast Iron under Controlled Conditions

Area of Science:

• Materials Science
• Corrosion Engineering
• Metallurgy

Background:

• Cast iron corrosion resistance is influenced by environmental factors, composition, and microstructure.
• Understanding corrosion layer formation is crucial for improving material durability.

Purpose of the Study:

• To investigate the corrosion layer formation on SiMo ductile iron under controlled chemical conditions.
• To evaluate the effect of molybdenum on the corrosion resistance of cast iron.

Main Methods:

• Utilized a heating chamber with a controlled atmosphere (HT-HRD) for sample treatment.
• Employed X-ray Diffraction (XRD) for qualitative and quantitative analysis of the oxide layer.
• Observed the sequence of oxide layer growth through multiple heating cycles.

Main Results:

• The addition of molybdenum was found to significantly improve the corrosion resistance of SiMo cast iron.
• An increase in hematite (Fe2O3) and magnetite (Fe3O4) content was observed with successive heating cycles.
• Molybdenum promotes the formation of a dense oxide layer, hindering further corrosion progression.

Conclusions:

• Molybdenum addition is beneficial for enhancing the corrosion resistance of SiMo ductile iron.
• The protective oxide layer formed is attributed to the presence of molybdenum, which limits corrosion.
• Higher molybdenum content correlates with a reduced oxide layer thickness, indicating improved material stability.