镁合金在NaCl溶液中的腐蚀电化学行为  

Electrochemical Behavior of Magnesium Alloys in Sodium Chloride Solution

作　　者：郝世雄[1] 附青山[1] 余祖孝[1] 

机构地区：[1]四川理工学院材料与化学工程学院材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《材料保护》2013年第11期32-33,36,共3页Materials Protection

基　　金：材料腐蚀与防护四川省重点实验室科研基金资助项目(2010CL03)

摘　　要：为了提高镁合金材料的耐蚀性能,用电化学方法对比研究了AZ31,AZ61和AZ91镁合金在3.5%NaCl溶液中的电化学行为及缓蚀剂亚硝酸钠(NaNO2)对AZ61腐蚀电化学行为的影响。结果表明:3种镁合金的腐蚀速度大小依次为AZ31>AZ61>AZ91,其中AZ31的活化性能最高;NaNO2能抑制AZ61的析氢腐蚀速度,腐蚀表面较均匀,腐蚀电流密度J corr降低,腐蚀电位E corr发生正移;NaNO2属于阳极型缓蚀剂,其含量为2.0%时,对AZ61的缓蚀率高达85.1%。The electrochemical behaviors of AZ31, AZ61 and AZ91 magnesium alloys in 3. 5%( mass fraction; the same hereafter) NaCl solution were comparatively evaluated with electrochemical method,and the effect of inhibitor NaNO 2 on the corrosion behavior of AZ61 Mg alloy was investigated. Results showed that the corrosion rates of the three kinds of Mg alloys were ranked as AZ31 > AZ61 > AZ91,and Mg alloy AZ31 had the highest activity. Inhibitor NaNO 2 was able to reduce the hydrogen-evolution corrosion rate and corrosion current density of AZ61,giving relatively uniform corroded surface and positively shifted corrosion potential. Moreover,NaNO 2 belonged to anode inhibitor,and it had an inhibition rate of as much as 85. 1% for AZ61 when its dosage in 3. 5% NaCl solution was fixed at 2. 0%.

关 键 词：电化学腐蚀行为 镁合金 NACL溶液 缓蚀剂NaNO2 

分 类 号：TG172[金属学及工艺—金属表面处理]