摘要： 开发了一种可以取代铬酸盐处理技术的环氧富镁底漆，对铝合金材料提供牺牲阳极保护。通过对镁粉的表面处理和配方优化，获得了贮存稳定、便于喷涂的富镁底漆;通过涂层基本性能测试、盐雾试验、金相显微镜观察确定了镁粉的合适用量，研究了镁粉细度对涂层性能的影响，考察了防沉剂的选择和用量对体系贮存稳定性的影响，以及涂层对 2024-T3铝合金材料的保护效果。研究表明:镁粉在富镁底漆中合适的 PVC为 45%左右，粒径小有助于增加其在体系中的添加量;气相 SiO2 和有机膨润土配合使用可以获得更满意的贮存稳定性;富镁底漆对 2024-T3铝合金表现出优越的耐盐雾保护性能。
关键词:
富镁底漆,
环氧树脂,
铝合金保护,
盐雾试验,
贮存稳定性
Abstract: A kind of magnesium-rich epoxy primer, has been developed which could replace chromate- treatment technology and provide sacrificial protection for aluminum alloy.The Mg-rich primer showed excellent storage stability and easily application by surface treatment of magnesium powder and optimization of recipe. Through tests of basic performance,salt-spray and surface morphology by metallurgical microscope the approprate dosage of magnesium powder in the Mg-rich system was determined and effects of fineness of magnesium powder on coating performance were investigated. Furthermore effects of anti-settling agent's types and dosage on storage stability were studied and protective performance of the Mg-rich primer for 2024-T3 aluminum alloy were investigated. The result showed that in the Mg-rich primer, suitable PVC of magnesium powder was about 45%, and small size of magnesium powder was benefit for higher loading. Use of fumed silica and organic bentonite would lead the system better storage stability. The Mg-rich primer could provide excellent salt spray -resistance protection for 2024-T3 aluminum alloys.
Key words:
magnesium-rich primer,
epoxy resin,
protection of Al alloy,
salt spray test,
storage stability
戈成岳, 付文峰, 凌建雄, 陈卓元, 罗运柏. 铝合金保护用富镁底漆的研制及其性能研究[J]. 涂料工业, 2013, 43(4): 23-29.
Ge Chengyue. Fu wenfeng, Ling Jianxiong, Chen Zhuoyuan, Luo Yunbai. Study on Preparation and Property of Magnesium -Rich Primer Used for Protection of Aluminum Alloy[J]. Paint & Coatings Industry, 2013, 43(4): 23-29.