文章信息/Info

Title:

Corrosion Behavior of 6061 Aluminum Alloy in Simulative Industry-marine Atmospheric Environment

作者:

楊  浪;  趙起越;  賀  建;  李曉剛;  黃運(yùn)華

（1.北京科技大學(xué)腐蝕與防護(hù)中心，北京 100083）（2.中國(guó)計(jì)量科學(xué)研究院，北京 100013）

Author(s):

YANG Lang1; ZHAO Qiyue1; HE Jian2; LI Xiaogang1; HUANG Yunhua1

（1.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China)（2.National Institute of Metrology China, Beijing 100013, China)

關(guān)鍵詞:

6061鋁合金; 工業(yè)海洋大氣; 沿晶腐蝕; 點(diǎn)蝕; 室內(nèi)加速腐蝕

Keywords:

6061 aluminum alloy;  industry-marine atmospheric environment;  intergranular corrosion;  pitting corrosion;  indoor accelerated corrosion

DOI:

10.7502/j.issn.1674-3962.2018.01.05

文獻(xiàn)標(biāo)志碼:

A

摘要:

通過(guò)紫外輻射老化實(shí)驗(yàn)和周期浸潤(rùn)實(shí)驗(yàn)，利用腐蝕表面和截面形貌分析、力學(xué)性能測(cè)試及拉伸斷口掃描分析等，研究了6061鋁合金在模擬工業(yè)-海洋大氣環(huán)境下的腐蝕行為及機(jī)理。腐蝕形貌觀察發(fā)現(xiàn)，6061鋁合金在該環(huán)境下的腐蝕由點(diǎn)蝕引起并擴(kuò)展，同時(shí)，試樣發(fā)生沿晶腐蝕，8周期后沿晶腐蝕裂紋擴(kuò)展深度達(dá)80 μm。模擬工業(yè)-海洋大氣環(huán)境中的硫化物不僅對(duì)試樣表面的點(diǎn)蝕產(chǎn)生很大影響，而且硫酸根離子會(huì)隨著腐蝕介質(zhì)深入晶界，加速沿晶腐蝕。力學(xué)性能分析表明，在該環(huán)境下腐蝕8個(gè)周期后，試樣的延伸率大幅下降，下降率達(dá)26%，斷裂機(jī)理發(fā)生改變，點(diǎn)蝕和沿晶腐蝕導(dǎo)致6061鋁合金從韌性斷裂轉(zhuǎn)變?yōu)榻饫泶嘈詳嗔选?/span>

Abstract:

The corrosion behavior and mechanism of 6061 aluminum alloy in simulated industrial-marine atmospheric environment were studied by means of UV radiation aging and cyclic wet-dry experiment, and the analyses of corrosion morphology of surface and cross section, mechanical property and tensile fracture. The morphology observation showed that the corrosion of 6061 aluminum alloy in this environment was initiated by pitting corrosion, the intergranular corrosion occurred and aggravated with the time increased, and the deepest crack of intergranular corrosion reached 80 μm in the end of eighth experiment cycles. The sulfide in the simulated industry-marine environment not only had a great impact on the pitting of the surface, but also the sulfite ions penetrated into the grain boundary with the corrosive medium and promoted the intergranular corrosion. The analysis of mechanical properties showed that the elongation rate of the specimens reduced by 26% after 8 cycles of experiment in this environment, and the corresponding mechanism changed from ductile fracture to cleavage fragile fracture caused by pitting and intergranular corrosion.