材料研究与应用
材料研究與應用
재료연구여응용
MATERIALS RESEARCH AND APPLICATION
2013年
3期
168-173
,共6页
李朝兴%徐静%李劲风%邓畅光%陈和兴
李朝興%徐靜%李勁風%鄧暢光%陳和興
리조흥%서정%리경풍%산창광%진화흥
1420Al-Li合金%开尔文探针%腐蚀%MgCl2液滴
1420Al-Li閤金%開爾文探針%腐蝕%MgCl2液滴
1420Al-Li합금%개이문탐침%부식%MgCl2액적
1420 Al-Li alloy%kelvin probe%corrosion%MgCl2 droplet
采用开尔文探针对1420Al-Li合金在初始浓度为0.1~1.0 mol/L、体积为4μL的M gCl2液滴下的腐蚀行为进行了研究.结果表明,当M gCl2液滴初始浓度为0.1,0.3 mol/L时,主要发生丝状腐蚀,其电位基线在-0.7~-0.8VSHE范围内,随着合金表面丝状腐蚀生长的停止与开始,出现电位突然增加而后立即下降的现象.当初始浓度增加到1 mol/L时,主要发生孔蚀,随着孔蚀的不断形成与钝化,出现电位突降而后立即回复的现象.当液滴达到环境相对湿度后,随着M gCl2初始浓度的增加阴极极限电流减小,腐蚀速率降低.
採用開爾文探針對1420Al-Li閤金在初始濃度為0.1~1.0 mol/L、體積為4μL的M gCl2液滴下的腐蝕行為進行瞭研究.結果錶明,噹M gCl2液滴初始濃度為0.1,0.3 mol/L時,主要髮生絲狀腐蝕,其電位基線在-0.7~-0.8VSHE範圍內,隨著閤金錶麵絲狀腐蝕生長的停止與開始,齣現電位突然增加而後立即下降的現象.噹初始濃度增加到1 mol/L時,主要髮生孔蝕,隨著孔蝕的不斷形成與鈍化,齣現電位突降而後立即迴複的現象.噹液滴達到環境相對濕度後,隨著M gCl2初始濃度的增加陰極極限電流減小,腐蝕速率降低.
채용개이문탐침대1420Al-Li합금재초시농도위0.1~1.0 mol/L、체적위4μL적M gCl2액적하적부식행위진행료연구.결과표명,당M gCl2액적초시농도위0.1,0.3 mol/L시,주요발생사상부식,기전위기선재-0.7~-0.8VSHE범위내,수착합금표면사상부식생장적정지여개시,출현전위돌연증가이후립즉하강적현상.당초시농도증가도1 mol/L시,주요발생공식,수착공식적불단형성여둔화,출현전위돌강이후립즉회복적현상.당액적체도배경상대습도후,수착M gCl2초시농도적증가음겁겁한전류감소,부식속솔강저.
The corrosion behaviors of 1420Al-Li alloy under 4 μl MgCl2 solution drops with initial concen-tration of 0 .1~1 .0mol/L were studied using a kelvin probe .The results showed that the filiform corro-sion mainly occurred when adding the MgCl2 drops with initial 0 .1mol/L and 0 .3mol/L concentration ,and the Volta potential baseline was at the range of -0 .7 to -0 .8 VSHE .The electric potential increased sud-dently and then decreased immediately ,which could be associated with the filiform corrosion growth stop and initiation .In the case of 1 .0mol/L initial concentration ,the meta-stable pitting corrosion mostly ap-peared ,and the electric potential exhibitted a sudden decrease and then immediate recovery ,which was as-sociated with the initiation and re-passivation of meta-stable pits .After the MgCl2 droplets reached the en-vironmental relative humidity , the cathodic limiting current associated with oxygen reduction was de-creased with increasing the initial MgCl2 concentration and the corrosion rate was decreased .