高硅铝合金缸套材料腐蚀加工技术研究

采用三维视频显微金相技术对高硅铝合金缸套材料的组织构成、颗粒尺寸以及碱腐蚀深度进行测试与评价;用激光共聚焦显微镜技术对碱腐蚀界面颗粒凹凸以及表面纹理进行观察与描述;用往复式摩擦磨损实验机对碱腐蚀试样进行摩擦学性能评价。结果表明:高硅铝合金组织中主要由硅颗粒及第二相硬质点颗粒构成,平均硅颗粒尺寸为4.00μm,平均第二相颗粒尺寸为3.05μm;随腐蚀时间、深度的增加,腐蚀界面区域增大,表面凸凹及纹理更加清晰,当碱的质量分数为5%,溶液温度为40℃,腐蚀时间为30~40 s,摩擦学性能最优越。

Corrosion processing technology of high-silicon aluminium alloy cylinder sleeve material

The micro-structure,particle size and alkaline corrosion depth of high-silicon aluminium alloy cylinder sleeve materialwere tested by three-dimensional video micro-metallographical technique;The concave-convex of particles and surface textureon the alkaline corrosion interface were observed by laser confocal microscopy technique;The tribology property of alkalinecorrosion samples was evaluated by reciprocating friction-wear tester. Results show that the micro-structure of high-siliconaluminium alloy was composed of Si particles with average size 4.00 μm and hard second phase particles with average size 3.05μm. With the extension of corrosion time,the corrosion depth increases and corrosion interface enlarges. The surface concave-convex is more clearer as well. Through friction-wear test,it is also revealed that the tribology property reaches the best under thecondition that alkaline concentration was 5Wt%,solution temperature is 40 ℃ and alkaline corrosion time is 30~40 s.