(1. 東北大學(xué) 材料與冶金學(xué)院，沈陽 110004；
2. 安徽工業(yè)大學(xué) 冶金與資源學(xué)院，馬鞍山 243002)
摘 要: 為提高泡沫鋁耐高溫及耐蝕性，對其表面電鍍鎳層。采用掃描電鏡觀察鍍層的表面形貌，進行鍍層與基體的結(jié)合力測試、常溫及650 ℃以上高溫壓縮測試及常溫下中性電化學(xué)腐蝕研究。結(jié)果表明：一定范圍內(nèi)，電流密度越大，鍍層結(jié)晶越致密；但電流密度過大(≥3 A/dm2)時，鍍層區(qū)域結(jié)晶反而粗大；由于走位劑的添加，深鍍能力提高；鍍層與基體結(jié)合良好，在電流密度為1 A/dm2、鍍層厚度為28~30 µm時，鎳層與基體界面結(jié)合力達到最大；鍍鎳后的泡沫鋁壓縮彈性模量提高了2.3倍，平臺應(yīng)力提高了1.5倍，由于鎳層的存在，泡沫鋁在650 ℃以上高溫壓縮時強度依然存在；鍍鎳后泡沫鋁自腐蝕電位、電蝕電位、致鈍電位分別正向移動238、51和220 mV，耐腐蝕性能提高。
關(guān)鍵字: 泡沫鋁；電鍍；結(jié)合強度；熱震；耐蝕性；壓縮
（1. School of Material and Metallurgy, Northeastern University, Shenyang 110004, China;
2. School of Metallurgy and Resources, Anhui University of Technology, Maanshan, 243002, China）
Abstract:Aluminum foams were electroplated Ni coatings to improve its assistance to heat and corrosion. SEM was used to observe the surface topography of the coatings, while the cohesive force between coatings and matrix compress (ambient temperature and above 650 ℃) and neutral electrochemistry corrosion were tested. The results show that the compactness of coatings is in proportion to the current density in a certain field but the oversize conditions (≥3 A/dm2), and the covering ability improves due to the additives. The adhesion between coatings and aluminum foam matrix is good and reaches its maximum value at the current density of 1 A/dm2 and coating thickness of 28−30 µm. The elastic modulus and plateau stress of aluminum foams with Ni coatings are 2.3 and 1.5 times of those without coatings, respectively. Because of Ni coatings, the strength of aluminum foams still exists at temperature above 650 ℃. Ecorr, Epit and Epp of aluminum foams shift 238, 51 and 220 mV towards positive after electroplated, respectively.
Key words: aluminum foam; electroplating; bonding force; hot shock; corrosion assistance; compress
