CAJ | 학술논문

通过分析Al-7Zn-0.1Sn-0.015Ga-2Mg阳极合金中的第二相及其腐蚀特性,研究第二相对该合金腐蚀行为的影响.结果表明:Al-7Zn-0.1Sn-0.015Ga-2Mg阳极合金中的第二相主要为球状和棒状的MgZn2相.MgZn2相的腐蚀电位较α(Al)基体的负,腐蚀电流密度较高且极化电阻较小.MgZn2相对于α(Al)基体为阳极相,其在3.5%NaCl溶液中与α(Al)基体组成腐蚀微电池,引起MgZn2相自身优先溶解,进而引发合金全面溶解.
통과분석Al-7Zn-0.1Sn-0.015Ga-2Mg양겁합금중적제이상급기부식특성,연구제이상대해합금부식행위적영향.결과표명:Al-7Zn-0.1Sn-0.015Ga-2Mg양겁합금중적제이상주요위구상화봉상적MgZn2상.MgZn2상적부식전위교α(Al)기체적부,부식전류밀도교고차겁화전조교소.MgZn2상대우α(Al)기체위양겁상,기재3.5%NaCl용액중여α(Al)기체조성부식미전지,인기MgZn2상자신우선용해,진이인발합금전면용해.
@@@@Influence of the second phase on the corrosion behavior of Al-7Zn-0.1Sn-0.015Ga-2Mg alloy was investigated through the analysis of the second phase and its corrosion characteristics in Al-7Zn-0.1Sn-0.015Ga-2Mg alloy. The results show that the second phases in Al-7Zn-0.1Sn-0.015Ga-2Mg alloy mainly are MgZn2 particles with spherical and rod-like. MgZn2 has a more negative corrosion potential, a higher corrosion current density and a smaller polarization resistance than α(Al) matrix. The MgZn2 particles are the anodic phase relative to α(Al) matrix, they form many micro-corrosion cells with α(Al) matrix in 3.5% NaCl solution, which lead to the anodic self-dissolution of MgZn2 particles preferential, and resulting in the whole dissolution process of the aluminum sacrificial anode.