Alloy with ultrafine crystal grains and excellent corrosion resistance

摘要

PURPOSE: To obtain an alloy having an ultrafine crystalline-grained structure excellent in corrosion resistance by incorporating components in a combining state of a specified amt. of hydroxides into a surface film. ;CONSTITUTION: This ultrafine crystalline alloy is the one in which at least 50% of the structure is constituted of fine crystalline grains and having a surface film in which the components in a combining state of hydroxides are present in a ratio of ≥65% to oxide components. In this way, the alloy with an ultrafine crystalline-grained structure remarkably excellent in corrosion resistance can be obtd. In the case it is constituted of the ultrafine crystalline grains having ≤500Å grain size, its corrosion resistance is improved as well as its magnetic properties and mechanical properties are improved to preferably obtain the result as the practical material. In particular, the grain size of 20 to 200Å is preferable because the structure is refined and the allay is homogenized.;COPYRIGHT: (C)1994,JPO&Japio