CAJ | 학술논문

研究了AZ31镁合金在Hank's模拟体液中的腐蚀行为,包括腐蚀形貌、腐蚀速度和腐蚀电化学特征参数.通过扫描电子显微镜(SEM)比较了不同腐蚀环境中镁合金样品的腐蚀形貌特征.利用失重法测量了镁合金的腐蚀速度,并依此分析了Hank's模拟体液中各成分对镁合金腐蚀速度的影响.测量并分析了不同pH值下的动电位动态极化曲线.结果表明,镁合金在Hank's模拟体液中的腐蚀主要为氯离子引起的点蚀;H_2PO_4~-和HPO_4~(2-)具有缓蚀作用;pH值的升高可以提高镁合金腐蚀反应的自腐蚀电位,降低腐蚀反应的热力学倾向,稳定腐蚀过程中形成的钝化膜,从而降低了腐蚀速度.
연구료AZ31미합금재Hank's모의체액중적부식행위,포괄부식형모、부식속도화부식전화학특정삼수.통과소묘전자현미경(SEM)비교료불동부식배경중미합금양품적부식형모특정.이용실중법측량료미합금적부식속도,병의차분석료Hank's모의체액중각성분대미합금부식속도적영향.측량병분석료불동pH치하적동전위동태겁화곡선.결과표명,미합금재Hank's모의체액중적부식주요위록리자인기적점식;H_2PO_4~-화HPO_4~(2-)구유완식작용;pH치적승고가이제고미합금부식반응적자부식전위,강저부식반응적열역학경향,은정부식과정중형성적둔화막,종이강저료부식속도.
Corrosion behavior of AZ31 magnesium alloy in Hank's simulated body fluid was investigated. It is found that the form of corrosion is dominated by pitting, which is caused by Cl~-. The individual influence of ingredients of Hank's simulated body fluid was studied by immersion test,showing that HPO_~(2-) and H_2PO_4~- can inhibit the corrosion process to a significant extent. Electrochemical test shows that elevated pH value of Hank's simulated body fluid may increase the corrosion potential,stabilize the protective layer,and lead to lower corrosion rate.