摘要
为提高泡沫铝耐高温及耐蚀性，对其表面电镀镍层。采用扫描电镜观察镀层的表面形貌，进行镀层与基体的结合力测试、常温及650℃以上高温压缩测试及常温下中性电化学腐蚀研究。结果表明：一定范围内，电流密度越大，镀层结晶越致密；但电流密度过大（≥3 A／d㎡）时，镀层区域结晶反而粗大；由于走位剂的添加，深镀能力提高；镀层与基体结合良好，在电流密度为1 A-d㎡、镀层厚度为28-30μm时，镍层与基体界面结合力达到最大；镀镍后的泡沫铝压缩弹性模量提高了2．3倍，平台应力提高了1．5倍，由于镍层的存在，泡沫铝在650℃以上高温压缩时强度依然存在；镀镍后泡沫铝自腐蚀电位、电蚀电位、致钝电位分别正向移动238、51和220mV，耐腐蚀性能提高。
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/d㎡）, 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/d㎡ 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 ℃. Eeor, epit and Epp of aluminum foams shift 238, 51 and 220 mV towards positive after electroplated, respectively.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2012年第9期2572-2577,共6页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50904019)
关键词
泡沫铝
电镀
结合强度
热震
耐蚀性
压缩
aluminum foam
electroplating
bonding force
hot shock
corrosion assistance
compress
