Preparation and Microstructure Properties of Alloy Mg-9Al-4Ca-2Cu
The preparation of an alloy to mitigate the impact of corrosion on oil and gas fields is described by using a plasma discharge sintering furnace(SPS).Al,Ca,and Cu elements were added to Mg to prepare alloy Mg-9Al-4Ca-2Cu to obtain the second phase Mg2Ca and Mg2Cu by using modern analytical techniques for observation and analysis,characterizing the corrosion resistance of alloys by using steel N80.The results show that after alloy treatment,the corrosion resistance of steel N80 improved,and the corrosion voltage increased from-0.672 V to-0.452 V;Corrosion current from 1.572 × 10-5 A·cm-2 became 8.1 × 10-6 A·cm-2,obtaining the potential difference between the second phase and the matrix phase by calculating the electronic work functions of the matrix phase and the second phase using first principles.The results show that the potential difference between α-Mg and Mg2Ca is-750 mV～-460 mV,and the potential difference between α-Mg and Mg2Cu is-392 mV～106 mV,forming two pairs of galvanic corrosion,which can release excess electrons into the solution and inhibit the dissolution of the anode metal.
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