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Effect of boron concentration on the corrosion resistance of cast B-bearing steel in molten zinc

✍ Scribed by Fu Hanguang; Song Xuding; Lei Yongping; Xing Jiandong

Publisher
John Wiley and Sons
Year
2008
Tongue
German
Weight
394 KB
Volume
59
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

The microstructures, mechanical properties and corrosion resistance in molten zinc of five kinds of cast B‐bearing steels containing X wt% B ‐ 0.8 wt% Si ‐ 1.0 wt% Mn ‐ (1.0∼2.0) wt% Cr ‐ (0.3∼0.5) wt% C (X = 0.50, 1.00, 1.50, 2.00, 2.50) were studied. The effects of boron concentration on microstructure and mechanical properties of cast B‐bearing steels have been investigated by optical microscopy (OM), X‐ray diffraction (XRD) analysis, hardness and impact tester. The evaluation of corrosion resistance in molten zinc of cast B‐bearing steel is calculated from the slopes of mass loss versus dipping time and surface area of sample at 480 °C. The results showed that boride volume fraction and hardness increased and the impact toughness of cast B‐bearing steel decreased with the increase in boron concentration. The corrosion rate of cast B‐bearing steels decreased and corrosion resistance in molten zinc increased with the increase in boron concentration. Moreover, the corrosion rate of cast B‐bearing steels decreased with the increase in temperature of molten zinc.

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