新聞資訊
含釔AZ91鎂合金在連續浸泡與干濕交替環境中的腐蝕行為
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-31
研究添加不同含量稀土釔(Y)的AZ91鎂合金在連續浸泡及干濕交替腐蝕環境中的腐蝕行為。
含釔AZ91鎂合金在連續浸泡與干濕交替環境中的腐蝕行為Corrosion behavior of AZ91 magnesium alloys with yttrium under immersion and dry-wet cyclic environments
研究添加不同含量稀土釔(Y)的AZ91鎂合金在連續浸泡及干濕交替腐蝕環境中的腐蝕行為。結果表明：添加稀土Y的AZ91鎂合金，腐蝕形貌轉變為“絲狀”腐蝕；在連續浸泡溶液環境中，腐蝕沿著同一條“絲”發展。而在干濕交替腐蝕環境中，腐蝕主要在濕環境下產生和發展，在干環境下停滯。重新置入濕環境時，舊的腐蝕“絲”不會明顯發展，而會形成新的腐蝕“絲”，鎂合金表面“絲狀”腐蝕數量隨干濕交替循環腐蝕次數增加而增多?！敖z狀”腐蝕形貌的形成是由于稀土添加降低了Al元素在晶界上的分布，使得表面析氫腐蝕不易受到阻礙，腐蝕以“腐蝕絲”末端持續析氫向前發展。電化學阻抗測試結果表明：干濕交替腐蝕環境中的電荷轉移電阻明顯低于連續浸泡環境中對應的電荷轉移電阻，這是因為干濕交替過程中，薄液膜的存在延長了鎂合金的析氫時間，而干環境的干燥作用破壞了鎂合金表面膜的完整性。
The corrosion behavior of AZ91 magnesium alloys with different additions of rare earth yttrium under immersion and dry-wet cyclic environments was studied. The results show that the differences in corrosion morphologies can be found between AZ91 alloy and the alloys with Y additions. The corrosion morphology of the original AZ91 alloy is featured with localized corrosion morphology while the corrosion morphologies of the alloys with Y additions are characterized by filiform corrosion feature. The corrosion extends along the same “line” when the alloys with Y addition are exposed to the immersion environment.However, the corrosion just initiates and develops in wet cyclic period, and suspends during the dry cyclic period when they are exposed to dry-wet cyclic environment. Besides, when the magnesium alloys with Y additions are exposed to the wet environment again, the original filiform corrosion does not extend any more, but new filiform corrosion can be found in other location. With the increase of dry-wet cycles, the number of filiform corrosion on the surface of magnesium alloys increases. The effect of rare earth Y on refining the grain of secondary phase and decreasing the Al distribution along the grain boundaries of the secondary phase leads that hydrogen evolution can not be impeded easily, and corrosion develops in the way of continued hydrogen evolution along the end of corrosion location. This is the reason why the filiform corrosion morphologies form. Electrochemicalimpedance spectra measurements indicate that the charge transfer resistance tested in dry-wet cyclic environment is much lower than that in immersion environment, suggesting that the magnesium alloys suffer heavier corrosion in dry-wet cyclic environment, which is relate to that the time of hydrogen evolution is prolonged under thin electrolyte layers and the integrity of the surface film of magnesium alloy is broken because of the drying effect under dry environment.
作為值得信賴的合作伙伴和高品質金屬合金的半成品供應商，艾荔艾擁有完善的服務體系和專業的團隊。在同客戶交易的過程中，我們力求根據不同的應用需求將我們的產品做到精益求精。針對當前和未來的市場需求，艾荔艾致力于為客戶提供最佳的金屬材料解決方案。
AILIAI has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. AILIAI develops the best alloy material solutions for current and future challenges.
獲取更多我們供應的合金和服務信息，請致電086-021-67660801或發電子郵件kefu@ailiaigroup.com聯系我們，您也可以通過微博，微信和領英與我們互動。
For more information on the alloys and services that we supply,?call us?at 086-021-67660801 or email us at kefu@ailiaigroup.com. You can also get in touch on social media, we are constantly active on?Weibo,?Weixin?and?LinkedIn.