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High-energy ball milling copper alloy and anti-corrosion

Author: ZhangXueWen
Tutor: CaiXiaoLan
School: Kunming University of Science and Technology
Course: Physical Chemistry of Metallurgy
Keywords: Energy ball mill Copper and zinc aluminum alloy Granularity Bulk ratio Oxidation corrosion
CLC: TF123.111
Type: Master's thesis
Year: 2009
Downloads: 49
Quote: 0
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Abstract


Copper has a higher thermodynamic stability, hydrogen depolarization does not occur, is listed as one of the corrosion-resistant metal. However, in high humidity and corrosive media (such as air containing sulfur dioxide, an oxygen-containing water, oxidizing acid as well as in the presence of CN-, NH4, etc. can be formed with copper complex ion liquid), the copper occurs more serious corrosion. And copper alloys exhibit corrosion resistance higher than copper. CuZnAl powder by the high-energy ball mill to determine the parameters of the preparation of the copper alloy, such as additives and their amounts, the milling rate, milling time. And then according to the polishing of the copper alloy powder particle size D50 ≤ 15μm, the ratio of bulk greater than 1.00 g/cmm3, SEM analysis, the morphology of the test, and gradually come to better grinding flake copper alloy powder basic parameters: filled with N2 dry milling, ball milling speed in 1000/800r.min-1 alternating once every 60 seconds, the last two minutes of the speed of 200r.min-1; milling time was 60min; the ball material than metal alloy powder: Ball = 1: 20; additives 1.5g A4 No. aids, grinding out the copper and zinc aluminum alloy powder Loose than 1.46 g/cm3, and the particle size of 8.09μm which is good. By SEM analysis of the morphology seen grinding of copper and zinc aluminum alloy is very the rules uniform appearance; seen from XRD alloy formation, preparation of copper and zinc aluminum alloy of high energy ball milling is entirely feasible. Oxidation corrosion of copper powder select to detect suitable methods as well as conduct a more systematic analysis; better sheet of copper and zinc alloy grinding process parameters derived by chemical titration analysis and comparison of copper and zinc aluminum alloy test; obviously seen alloy antioxidant corrosion of the aluminum alloy of copper and zinc powder prepared after adding Class B grinding aids than Class A grinding much stronger, corrosion test shows copper and zinc aluminum alloy powder is prepared by the Class B additives grinding did not go through polished copper powder of 20 times or more of the anti-oxidation corrosion. With the extension of the test time in the anti-oxidation corrosion test by the copper-zinc alloy of the class B auxiliary grinding oxidation corrosion resistance further strengthened, and this may be an oxide film is formed to further oxidation corrosion. Finally studies have shown that copper and zinc alloy zinc-aluminum ratio of 1:6, with the increase in the total amount of its zinc aluminum corrosion antioxidant growing decline, but other properties (such as conductivity); simultaneously by EDS and XPS analysis of the surface coating. High energy ball milling aluminum alloy of copper and zinc for the preparation of anti-oxidation corrosion resistance to oxidative corrosion effect is very obvious, there is a very broad market prospects, especially important to conserve our resources.

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CLC: > Industrial Technology > Metallurgical Industry > Metallurgical Technology > Powder metallurgy (metal ceramic technology ) > Powder manufacturing methods > Powder general manufacturing method > Physical and mechanical method > Mechanical grinding method
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