(1. 中南大學(xué) 輕合金研究院，長(zhǎng)沙 410083；
2. 中南大學(xué) 有色金屬材料與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
3. 南車(chē)青島四方機(jī)車(chē)車(chē)輛股份有限公司，青島 266000)
摘 要: 采用硬度、電導(dǎo)率、拉伸和卡恩撕裂性能測(cè)試，結(jié)合差示掃描量熱法(DSC)、金相顯微鏡(OM)、掃描電鏡(SEM)和透射電鏡(TEM)研究不同腐蝕條件對(duì)Al-Zn-Mg鋁合金強(qiáng)韌性能的影響。結(jié)果表明:經(jīng)(25 ℃，3.5%NaCl；50 ℃，3.5%NaCl；100 ℃，3.5%NaCl；25 ℃，6%NaCl)腐蝕液浸泡后，材料的強(qiáng)度受腐蝕液溫度和濃度的影響，隨著3.5%NaCl腐蝕液溫度的升高，材料的強(qiáng)度呈現(xiàn)一種先降低后升高的趨勢(shì)，相對(duì)于未腐蝕材料，當(dāng)溫度從50 ℃變化到100 ℃時(shí)，3.5%NaCl腐蝕液浸泡后的材料強(qiáng)度上升比較明顯，為11.51 MPa；當(dāng)溫度為25 ℃時(shí)，6%NaCl腐蝕液中材料強(qiáng)度下降較大為10.25 MPa；材料的韌性則隨著腐蝕液溫度、濃度的升高而降低；經(jīng)(100 ℃，3.5%NaCl)腐蝕液浸泡后，材料的韌性與未腐蝕材料有明顯差別，韌性值下降10.4%，擠壓方向與垂直擠壓方向的韌性差值由原來(lái)的13.4 N/mm增大為32.4 N/mm。
關(guān)鍵字: Al-Zn-Mg鋁合金；腐蝕；強(qiáng)度；韌性
（1. School of Light Alloy Research, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China;
3. CSR Qingdao Sifang Co., Ltd., Qingdao 266000, China）
Abstract:The effect of different corrosion conditions on the strength and toughness of Al-Zn-Mg aluminum alloys was investigated by hardness, electrical conductivity, tensile test, Kahn tear test, differential scanning calorimetry (DSC), optical microscopy(OM), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results show that, after immersion in (25 ℃, 3.5%NaCl; 50 ℃, 3.5%NaCl; 100 ℃, 3.5%NaCl; 25 ℃, 6%NaCl) etching solution, the temperature and concentration of etching solution have effects on the strength of the material. With the temperature rise of 3.5%NaCl etching solution, the strength decreases firstly, and then increases, and the strength increases by 11.51 MPa when the temperature varies from 50 ℃ to 100 ℃. While the material is soaked in etching solution at the temperature of 25 ℃, the strength of material soaked in 6%NaCl etching solution decreases by 10.25 MPa compared with that of the free-corrosive material. The toughness decreases with the temperature rise of the etching solution and etching solution concentration. There are obvious differences between free-corrosive material and the material soaked in 3.5%NaCl etching solution at the temperature of 100 ℃, the toughness decreases by 10.4%, and the toughness difference varies from 13.4 N/mm to 32.4 N/mm between the extrusion orientation and vertical extrusion orientation.
Key words: Al-Zn-Mg aluminum alloys; corrosion; strength; toughness
