【作者】 郑周；

【导师】 杨川；

【作者基本信息】 西南交通大学 ， 材料科学与工程， 2011， 硕士

【摘要】 经气体多元共渗处理后的Q235钢件,有时表面颜色发红。本文通过对Fe-O系以及氢还原氧化铁反应进行热力学计算,研究出利用还原处理控制表面颜色的方法。同时,探索出一种扩散渗铝+气体多元共渗+还原处理的表面复合处理工艺。以达到提高材料表面抗盐雾腐蚀能力和改善单纯经气体多元共渗处理后表面颜色不均匀、不美观等缺点的目的。对不同工艺的各组样品进行了金相分析、盐雾腐蚀试验分析、物相分析,对抗拉强度、冲击性能、耐磨性能、硬度值进行对比分析。试验结果表明：对材料进行复合处理的样品,其表面颜色比仅进行多元共渗处理的样品和进行渗铝+多元共渗处理的样品表层颜色美观且均匀；仅进行多元共渗处理的样品表面主要成分为Fe2O3,经复合处理后的样品,表面主要成分为Fe3O4；复合处理样品抗蚀性能相对于仅进行多元共渗的样品抗蚀性有大幅提高,且抗拉强度比未经复合处理的样品略有提高,屈服强度提高10%以上,冲击吸收功则下降,而耐磨性能和硬度值均未下降。因此,经过对各种性能比较得出,复合处理后的样品表面颜色优,抗蚀性能强,抗拉强度、耐磨性能和硬度高,达到预想效果。更多还原

【Abstract】 The surface of steel Q235 is red sometimes after gas multicomponent thermochemical treatment. The thermodynamic calculation of Fe-O system and Fe2O3-H system was researched, and the surface color could be controlled by reduction reaction treatment. The chemical heat treatment on the surface of steel Q235 was researched, a composite heat treatment process,which including diffusion aluminizing+gas multicomponent thermochemical treatment+reduction reaction treatment,was explored,in order to improve the surface corrosion resistance to salt spray, improve the uneven、unsightly color and change the other shortcomings of the surface after gas multicomponent thermochemical treatment only.Samples in each group treated by different process, was analyzed by salt spray corrosion test、metallographic examination phase analysis、tensile strength analysis、impact properties test、wear-resistance test and hardness analysis.The results show that, the surface of the samples, processed by composite heat treatment, is more uniform and beautiful than the samples, which are processed by gas multicomponent thermochemical treatment and by diffusion aluminizing+gas multicomponent thermochemical treatment respectively. The major components is Fe2O3 on the surface of samples processed by gas multicomponent thermochemical treatment and by diffusion aluminizing+gas multicomponent thermochemical treatment, but Fe3O4 on the surface of samples processed by composite heat treatment, The corrosion resistance of which has a substantial increase than samples processed by gas multicomponent thermochemical treatment. The tensile strength of the composite heat treatment samples is slightly higher than samples without composite heat treatment, whose yield strength is 10% lower but impact properties is better than composite heat treatment samples, whose wear resistance and hardness values is not decreased. Consider all of the factors, in a word, samples with composite heat treatment, have a good performance in surface color、corrosion resistance、tensile strength、wear-resistance and hardness.更多还原