The corrosion-resistant amorphous Ni basic alloy spray deposit null which

摘要

PURPOSE:To improve corrosion resistance by providing an alloy composition in which specific amounts of Cr and P are incorporated to Ni to an Ni-base alloy powder for forming amorphous sprayed deposit. CONSTITUTION:This Ni-base alloy powder has a composition consisting of, by atom, 10-30% Cr, 12-25% P, and the balance Ni and containing, if necessary, 1-8% B and/or Si. This powder can be prepared by forming the molten alloy with the above composition into powder by a high-pressure water atomizing method and then subjecting this powder to drying and grading. When this powder is used as thermal spraying powder, an amorphous sprayed deposit excellent in corrosion resistance can be obtained. In the above composition, when Cr content is less than 10%, the desired superior corrosion resistance cannot be obtained and, when it exceeds 30%, the melting temp. of the powder is raised and many defects, such as bores, take place in the sprayed deposit, and further, making amorphous is inhibited and corrosion resistance is deteriorated. When P content is beyond the above range, making amorphous is inhibited. When B and Si contents are less than 1%, the desired improvement in the effect of making amorphous cannot be obtained and, when they exceed 8%, the action of making amorphous is deteriorated.