晶間腐蝕性能的影響
(1. 中南大學 材料科學與工程學院，長沙 410083；
2. 海軍裝備技術研究所，北京102442)
摘 要: 采用金相顯微鏡、電化學交流阻抗和掃描電鏡研究表面機械處理(噴砂和打磨)對5×××鋁合金/涂層體系的結合強度及晶間腐蝕性能的影響。結果表明：試樣經表面機械處理后，基體表面的清潔度提高，粗糙度增大，涂層與基體的結合強度顯著提高；其中表面噴砂后，基體與涂層結合強度提高198.7%；表面打磨后，基體與涂層結合強度提高167.4%；表面機械處理后，基體的耐晶間腐蝕能力明顯降低，但合金/涂層體系的耐晶間腐蝕能力顯著提高；表面噴砂后，合金/涂層體系與基體的耐蝕性都強于表面打磨后的耐蝕性。
關鍵字: 5×××鋁合金；結合強度；表面機械處理；晶間腐蝕
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Naval Institute of Technology and Equipment, Beijing 102442, China）
Abstract:Metallographic microscope, electrochemical impedance spectroscope and scan electron microscope were used to study the effects of surface mechanical treatment (shot blasting and polishing) on the coherent strength and intergranular corrosion (IGC) of the coated 5××× aluminium alloy. The results show that the surface mechanical treatments (shot blasting and polishing) can markedly improve the adhesive strength by increasing the cleanliness and roughness of the substrate. The adhesive strengths after shot blasting and polishing are elevated by 198.7% and 167.4%, respectively. The IGC resistance of the substrate after surface mechanical treatment obviously decreases, while the IGC resistance of the coated alloy significantly increases. Moreover, the corrosive resistances of the coated alloy and the substrate after shot blasting are both better than those after polishing.
Key words: 5××× aluminum alloy; adhesive strength; surface mechanical treatment; intergranular corrosion
