海洋工程用钢表面喷涂Zn、Al和Zn-55%Al伪合金涂层的耐蚀性

热喷涂金属涂层是当前海洋环境下钢结构件防腐的首选方法,利用电弧喷涂技术在新型海洋工程结构用钢(Q345B钢)表面制备了Zn-55%Al伪合金热喷涂涂层,并与纯Zn涂层和纯Al涂层的耐蚀性进行了对比。结果表明:纯Zn涂层能提供较好的电化学阴极保护作用,但电化学性能欠佳;纯Al涂层表现出优良的电化学性能,但腐蚀后期产生点蚀;Zn-55%Al伪合金涂层具有更优越的耐蚀性和腐蚀防护性能。     

Improving in-vitro biocorrosion resistance of Mg-Zn-Mn-Ca alloy in Hank’s solution through addition of cerium

Two kinds of Mg-Zn-Mn-Ca alloys with and without cerium were designed and fabricated. In-vitro degradation tests and electrochemical evaluations were carried out to compare their biocorrosion behavior in Hank’s solution at 37 oC. After adding cerium, the continuous network distributed Ca2Mg6Zn3 phases in Mg-2Zn-0.5Mn-1Ca alloy(Alloy I) were separated due to the emerging non-continuously distributed Mg2 Ca phase and Mg12 Ce Zn phase. This change led to corrosion acceleration of Mg matrix at the initial stage but also sped up the formation of compact corrosion products for Mg-2Zn-0.5Mn-1Ca-1.5Ce alloy(Alloy II), and therefore enhanced its biocorrosion resistance. Cerium containing Alloy II has the potential to be used as future biomaterials.     

化学镀金属包覆陶瓷粉体的研究与应用进展

化学镀是当前最具实用性的金属包覆型陶瓷粉体制备技术，由于该复合粉体兼有金属包覆层和陶瓷芯核优点而成为新材料领域的重要组成部分。针对目前化学镀制备金属／陶瓷复合粉体及其应用中所存在的关键问题，本文综述了化学镀包覆陶瓷粉末的工艺特点，探讨了影响镀液稳定性、沉积速率和镀层质量的主要因素，分析了金属包覆陶瓷粉体的应用研究概况及其发展趋势。     

NMZ1耐磨铸钢在模拟海水中的电化学腐蚀行为

测试了NMZ1低碳高强耐磨铸钢在3．5％NaCl溶液中的极化曲线和电化学阻抗谱（EIS）,结合腐蚀形貌观察分析了其电化学腐蚀机理,并以优质系泊链钢（22MnCrNiMo）为参照,评价了该新型海洋用钢的耐蚀性。结果表明,腐蚀初期NMZ1钢的耐蚀性不如系泊链钢,其分级淬火后组织中的残余奥氏体和下贝氏体诱发了选择性腐蚀,因而...     

ECAP加工Mg_(96.8)Gd_2Zn_1Zr_(0.2)合金的腐蚀行为研究

设计和熔炼了含LPSO(长周期堆垛有序结构)增强相的Mg_(96.8)Gd_2Zn_1Zr_(0.2)(原子分数,%)合金,采用等通道转角挤压(ECAP)技术对其进行了1至16道次的挤压加工,获得了超细晶合金试样,继而对比分析了其显微组织和耐蚀性。研究表明,随着挤压道次的增加,合金组织逐步得到细化和均匀化,粗大的X-Mg_(12)ZnGd相经历了变形-断裂-破碎-弥散的过程;ECAP后的合金由于铸造缺陷减少,表现出了更高的耐蚀性,其耐蚀性随挤压道次的增加先增后降。