Download PDF - Calgary Pump Symposium
Download PDF - Calgary Pump Symposium
Download PDF - Calgary Pump Symposium
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Weir Minerals North America<br />
Excellent<br />
Minerals<br />
Solutions<br />
Corrosion<br />
• Abrasion resistant white irons used in slurry<br />
pumps consist of hard carbides in a ferrous<br />
matrix.<br />
• The M 7 C 3 carbides are electrochemically<br />
passive and essentially protected from<br />
corrosion.<br />
• The corrosion resistance of the material is<br />
therefore a function of the corrosion resistance<br />
of matrix, which in turn is a function of the<br />
chromium content with in the matrix.<br />
• Corrosion of the supporting ferrous matrix can<br />
lead to premature fracture and spalling of the<br />
carbides.<br />
Chromium carbides in<br />
supporting ferrous matrix<br />
10
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