采用平面分流模具热挤压成型制备了内部镶嵌钢芯的 AZ31镁合金牺牲阳极,研究了挤压温度对其成形性能、显微组织、电化学性能以及在模拟土壤环境(饱和 CaSO 4-Mg(OH)2溶液)中腐蚀形貌的影响.结果表明：当挤压比为12,挤压温度为320~410℃时,AZ31镁合金阳极表面成形良好；晶粒尺寸随着挤压温度的升高先减小后增大,最小晶粒尺寸达到12．2μm；随着挤压温度的升高,镁合金电流效率和开路电位均先增大后减小,而表面腐蚀程度先减轻后加深,当温度为380℃时,电流效率和开路电位达到最大,分别为63．93％,－1．586 V,此时表面点蚀孔数量最少,腐蚀程度最轻.
AZ31 magnesium sacrificial anode containing a steel core was fabricated by hot extrusion using plane porthole dies,and the effects of extrusion temperature on the surface quality,microstructure,electrochemical property and corroded surface morphology of the magnesium anode in saturated calcium sulfate-magnesium hydroxide solution were investigated.The results show that the magnesium anodes with high appearance quality was obtained when the extrusion ratio reached 12 and temperature varied between 320 to 380 ℃;the grain size of the magnesium alloy first decreased then increased with the increase of extrusion temperature,and the minimum grain size reached 12.2 μm;with the extrusion temperature increase,the current efficiency and open circuit potential of the magnesium alloy first increased then decreased,while the corrosion degree first reduced then accelerated.At 380 ℃,the current efficiency and open circuit potential reached the largest value of 63.93% and - 1.586 V, meanwhile the surface pits quantity was the least as the corrosion degree was the lightest.
参考文献
| [1] | 郭忠诚,宋曰海,耿卫东.铝-锌-铟系列高性能牺牲阳极材料的研究[J].机械工程材料,2005(12):38-41. |
| [2] | 郭炜,文九巴,马景灵,焦孟旺.铝合金牺牲阳极材料的研究现状[J].腐蚀与防护,2008(08):495-498. |
| [3] | PARTHIBAN G T;PARTHIBAN T;RAVI R et al.Cathodic protection of steel in concrete using magnesium alloy anode[J].Corrosion Science,2008,50(3):329-335. |
| [4] | 马丽洁;郭忠诚;宋曰海 等.镁合金牺牲阳极及其在防腐工程中的应用[J].四川化工与腐蚀控制,2003,6(3):38-42. |
| [5] | 苏鹏,杜翠薇,李晓刚.AZ63镁合金牺牲阳极在高阻抗土壤环境中腐蚀行为研究[J].材料保护,2008(04):4-6,9. |
| [6] | 侯军才,张秋美.高电位镁牺牲阳极研究进展[J].中国腐蚀与防护学报,2011(02):81-85. |
| [7] | 黄凯 .AZ31镁合金新型挤压变形时组织性能与工艺的研究[D].重庆大学,2008. |
| [8] | 黄诗尧 .AZ31镁合金挤压成形微观组织演化的试验研究与数值模拟[D].上海交通大学,2010. |
| [9] | 侯军才,张秋美.纯镁牺牲阳极的熔铸及其电化学性能和腐蚀形貌[J].材料保护,2012(12):17-19. |
| [10] | 勇艳华 .青藏高原冻土层中镁合金阳极电化学性能研究[D].大连理工大学,2005. |
| [11] | YAMAUCHI K;ASAKURA S .Galvanic dissolution behavior of magnesium-1mass% manganeses-0.5 mass%calcium alloy anode for cathodic protection in fresh water[J].Materials Transactions,2003,44(5):1046-1048. |
| [12] | 陆国桢,王强,张治民,袁国.镁合金挤压成形技术的研究进展[J].热加工工艺,2012(15):86-89,94. |
| [13] | 宋曰海 .高性能铝、锌、镁合金系列牺牲阳极材料的研究[D].昆明理工大学,2003. |
| [14] | 宋曰海,郭忠诚,樊爱民,龙晋明.牺牲阳极材料的研究现状[J].腐蚀科学与防护技术,2004(01):24-28. |
| [15] | 张诗昌,段汉桥,蔡启舟,魏伯康,林汉同,陈渭臣.主要合金元素对镁合金组织和性能的影响[J].铸造,2001(06):310-315. |
| [16] | 张津;章宗和.镁合金及应用[M].北京:化学工业出版社,2004 |
| [17] | ANDREI M;GABRIETE F D;BONORA P L et al.Corrosion behavior of magnesium sacrificial anodes in tap water[J].Material Corrosion,2003,54(1):5-11. |
| [18] | YAMAUCHI K;ASAKURA S .Dissolution behavior of type Mg-1mass% Mn alloy anode for cathodic protection in fresh water[J].Corrosion Engineering,2003,52(2):107-108. |
| [19] | KIM J G;JOO J H;KOO S J .Development of high-driving potential and high-efficiency Mg-based sacrificial anodes for cathodic protection[J].Journal of Material Science Letters,2000,19:477-479. |
| [20] | 侯军才,张秋美.Mg-Mn高电位牺牲阳极的腐蚀行为[J].特种铸造及有色合金,2012(10):886-889. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%