机械镀锌层微观形貌及有机硅表面封孔耐腐蚀处理  

Microcosmic Appearance of Mechanical Zinc Coatings and Superficial Organic Silicon Pore Sealing and Anticorrosion Treatment

作　　者：卢杰[1] 石岩 

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255049 [2]淄博市锅炉压力容器检验所,山东淄博255030

出　　处：《表面技术》2007年第6期36-38,共3页Surface Technology

摘　　要：325目球形颗粒状锌粉在SnSO4水溶液中活化后，与工件和玻璃微殊在滚筒内依靠机械撞击力作用，形成Zn—Sn复合镀层以保护基体金属。由于形成镀层的过程处在酸性环境，在镀层增厚过程中不可避免把酸性溶液包裹在镀层里面，酸性溶液会与金属基体和镀层反应，产生氢气，必然会寻找通道选出，形成微气孔；镀层是逐渐形成的，新生镀层与原有镀层之间存在结合面；镀覆过程由于撞击力过大或者不均匀，镀层内部球形颗粒状锌粉变形较小，球形颗粒与球形颗粒的结合不严密等，这些原因会导致镀层产生微裂纹。电镜扫描镀层表面和断面形貌图片可证实这些问题确实存在。以甲基含氢硅油、钛酸四异丙酯、石油醚为组分复配，所得复配物对Zn—Sn复合镀成形层过程所导致的微气孔和微裂纹具有很好的渗透性。经试验确定甲基含氢硅油、钛酸四异丙酯、石油醚（馏程为90～120℃）分别占复配物的质量分数为11％、10％、79％。盐雾试验证实，在涂层厚度为0．2μm时，可延长镀层出现白色腐蚀产物时间近1倍，相应地延缓了镀层出现红锈的时间，证明在镀层表面进行封孔处理，能较大提高镀层的耐腐蚀性能。By using SnSO4 water solution to activate global granular Zn powders of 325 screen mesh, Zn-Sn composite coverage is formed under the action of mechanical impact of the tiny glass beads and work pieces for protecting parent metal. On account of the increasingly thick plating coat processed in acid environment, acid liquor is unavoidably occluded under the plating coat. Acid liquor will react with metal basal body and coats, and hydrogen gas is bound to emit from the pathway and form micro pores. In addition, there are bond areas between the new and the primary coverage because of the growing up of the plating coat, which may lead to the emergence of micro crack on the coating owing to such causes as too big or uneven impact during plating process, little distortion of global granular zinc dust inside the plating coat, less tight coalescence of the zinc dust flecks. These problems can be confirmed by SEM scanning coating surface and cross section pictures of plating coat. In our study, methyl hydrogen silicone fluid, titanium isopropoxide and benzinum are used as the basal components. This compound has better osmosis for micro pores and cracks formed in the process of dual coverage. Through tests, the weight percentage of the methyl hydrogen silicone fluid to the compound is determined separately as 11 percents, the titanium isopropoxide as 10 percents, and the benzinum（90 - 120 centigrade degree） as 79 percents. Salt fog test indicates that when the .coating thickness is 0.2 micron, the emergence time of white corrosion on the plating coat doubles, accordingly, that of red rust prolongs, which shows that the anticorrosion of the coverage can be significantly improved through superficial pore sealing in zinc plating coat.

关 键 词：机械镀锌层 甲基含氢硅油 钛酸四异丙酯 石油醚 固化反应 

分 类 号：TG174.46[金属学及工艺—金属表面处理] TQ153.4[金属学及工艺—金属学]