热镀铝锌硅镀层钢板(GL钢板)发生变形时,镀层中裂纹数量和大小对其耐蚀性有重要影响.对GL钢板进行单向拉伸,采用动电位极化法和电化学阻抗谱测试了GL钢板不同拉伸变形量时在3.5％NaCl溶液中的电化学腐蚀行为,采用扫描电镜观察了不同变形量时GL镀层电化学腐蚀前后的表面形貌.结果表明:GL钢板变形到一定程度,镀层便产生裂纹,裂纹随变形量的增加而变多、变大、变深;GL镀层的腐蚀优先在裂纹内发生,随变形量的增加,腐蚀的深度和面积逐渐增大,当变形量为20％时,镀层表面的裂纹扩展至镀层/钢基体界面,造成钢基体裸露,镀层耐蚀性大幅降低.
参考文献
| [1] | Dominic Phelan;Bao Jiang Xu;Rian Dippenaar .Formation of intermetallic phases on 55 wt.%Al-Zn-Si hot dip strip[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):144-149. |
| [2] | 陈斌锴,袁训华,张启富.热浸镀55%Al-Zn合金镀层钢板的镀层结构及防腐蚀机理[J].腐蚀与防护,2009(01):16-18,21. |
| [3] | O' Donnel A J;Sandenbergh R F .Comparison of the sacrificial protection afforded by continuous galvanized coatings[J].Corrosion Coats AFR,1990,16(10):2-6. |
| [4] | 袁训华,刘昕,陈斌锴,江社明,张启富.合金化镀层拉伸过程中裂纹产生及扩展的原位观察[J].金属热处理,2010(10):11-15. |
| [5] | Lee KK;Lee IH;Lee CR;Ahn HK .In-situ observation in a scanning electron microscope on the exfoliation behavior of galvannealed Zn-Fe coating layers[J].Surface & Coatings Technology,2007(14):6261-6266. |
| [6] | Takasugi T;Machida J.Plastic deformation and fracture behavior of galvannealed coating under compressive stress circumstance[A].Osaka:[s.n.],2007:230-235. |
| [7] | 姚文俐,董速伟,陈金清,陈星斌,刘平.热浸镀铝锌镀层在NaCl溶液中腐蚀电化学行为[J].有色金属科学与工程,2011(03):13-17. |
| [8] | 曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2008:99-102. |
| [9] | Barranco V;Jr S F;Feliu S .EIS study of the corrosion behavior of zinc-based coatings on steel in quiescent 3 ％NaCl solution.Part 1:directly exposed coatings[J].Corrosion Science,2004,46(15):2203-2220. |
| [10] | 郭大伟,袁训华,顾宝珊,李远鹏,江社明,张启富.杯突变形对热镀锌合金化镀层耐腐蚀性的影响[J].金属热处理,2012(12):74-78. |
| [11] | Sacco EA.;Alvarez NB.;Culcasi JD.;Elsner CI.;Di Sarli AR. .Effect of the plastic deformation on the electrochemical behavior of metal coated steel sheets[J].Surface & Coatings Technology,2003(2/3):115-122. |
| [12] | 郝小军,宋诗哲.铝锌合金在3%NaCl溶液中的电化学行为[J].中国腐蚀与防护学报,2005(04):213-217. |
| [13] | 李黎,顾宝珊,杨培燕.杯突变形对锌合金镀层耐腐蚀性能的影响[J].物理测试,2011(01):5-9. |
| [14] | 李华飞,郑家燊,俞敦义.热浸镀55%Al-Zn后钢的拉伸性能和耐蚀性能研究[J].机械工程材料,2002(03):25-28. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%