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> Business/Technology > CASTING

CASTING

NISSI CORPORTAION

Ni Resist cast Iron for corrosion protection of seawater Pumps.

The corrosion of stainless steels is maintained by the passive film on its surface. However, this passive film becomes destroyed when chloride iron is present, and result in localized corrosion such as crevice corrosion, pitting corrosion and stress corrosion cracking(SSC). The Ni-Resist cast irons are that its corrosion rate is evenly slower than that of conventional cast irons and that it is not subject to crevice corrosion and pitting corrosion. The disadvantage is that it is susceptive to SSC. Mechanisms and behavior of Ni-Resist SSC and measures against the same are discussed.

Material: ASTM A439 type R2, A436 type2