|Autors: Dyakova V.L., Kostova Y.G., Tzaneva, B. R.
Title: Effect of minority alloying elements Zn and Zr on the corrosion behavior of amorphous alloys АlCuMg(Zn) and AlCuMg(Zr) and their nanocrystalline analogues
Keywords: corrosion, amorphous, nanocrystalline, aluminum
Abstract: Rapidly solidified ribbons based on Al74Cu16Mg10 alloy were produced by Chill Block Melt Spinning (CBMS) method. In order to obtaine a crystalline structure the rapidly solidified ribbons were annealed in Ar atmosphere. The amorphous and nanocrystalline structure was confirmed by XRD and TEM analyzes. The effect of minority alloying elements Zn and Zr on the corrosion be-havior of rapidly solidified Al74Cu16Mg10 alloy in amorphous and nanocrystalline analogues was studied. Gravimetric tests for general corrosion at 25 °С and at 50 °С in environment of 3.5% NaCl are carried out. At 25 °С the corrosion rate of amorphous alloys was found to be 1.5 to 4 times lower than the rate of their crystalline analogues. The effect of amorphous - nanocrystalline struc-ture transformation on the corrosion rate at 50 °С is negative and most significant in the Zn-con-taining alloy. Electrochemical tests for general and local corrosion in 3.5% NaCl environment were performed and the galvanic mechanism..
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