Centrifugal casting produces stronger, more corrosion-resistant anodes compared to die cast or sand cast anodes. Centrifugal casting spins molten metal at high speeds onto a mold, creating a dense, homogenous structure without imperfections from gates or cores. This uniform cooling and dense structure makes centrifugally cast anodes physically stronger, less prone to breaking during installation or corroding during operation, and able to pass more stringent quality tests. Overall, centrifugally cast anodes have improved performance and reduced lifetime costs compared to other casting methods.

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Why are Centrifugal Cast FeSi
Anodes Better than Die Cast or Sand
Cast Anodes?
How an improved manufacturing
process can improve operational
performance and reduce costs

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How does Centrifugal Casting Work?
• Molten metal taken in
at the end
• No need for in-gate
• Rapid spinning forces
metal onto the mould
• No need for sand core
• Cooling is uniform

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Centrifugal Forces Ensure Homogenous Structure
• Rapidly spinning mould - over 1500rpm
• Pressures greater than 80 times gravity (80G)
• Pressure much greater that die casting
• High pressure ensures dense homogenous
wall section structure
• Denser wall structure means:
– Less prone to breakages
– Operationally less prone to corrosion

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No Requirement for In-Gate or Feed Metal Pool
• Feed metal immediately removed
• All metal therefore directed at the anode
• Differential cooling imperfections removed
• Removal of in-gate improves structure and …
• Removes faults that would fail x-ray test
• Prevents premature failure through:
– Corrosion
– Cracking

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Two Directional Solidification in Die Cast Anodes
• Sand Core needed to form the inner bore of
the Anode
• Sand cores cause premature “freezing” of the
metal at the surface
• Also, two directional cooling creates structural
weaknesses
• Gas and particle impurities are trapped
• Die Cast anodes may have a slight variance in
wall thickness

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One Directional Solidification
• Centrifugal cast Anodes solidify in one directional
only
• Metal cools rapidly and uniformly
• Creates a superior grain structure
• Gas and solid impurities thrown to inside of bore
• Metal with Improved structure and fewer
impurities is:
– stronger and less prone installation breakages
– Less prone to corrosion

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Summary Benefits of Centrifugal Cast Anodes
• Physically stronger units reduce installation
wastage
• Denser material in the Anode walls reduces
operational loss through corrosion
• Capable of passing more stringent NDT
requirements (e.g. X-ray) – fewer rejects
• Overall installation and lifetime cost
significantly reduced, while performance
improved

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Find Out More
Specialist Castings Ltd
Tatham Street
Sunderland
Tyne & Wear
SR1 2AG
United Kingdom
Phone: +44 (0) 191 510 8843
Email: info@specialistcastings.com
Web: www.specialistcastings.com