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采用丝材火焰喷涂工艺,分别在Q235钢基体表面设计和制备了热喷涂纯Zn涂层A和经氟碳树脂喷涂封孔处理的复合涂层B,并对这两种涂层分别进行自来水浸泡腐蚀试验。通过磁性测量法、称重法、切格测试法和失重法,分别测定了这两种喷涂涂层的厚度、密度、结合强度和耐蚀性能。借助X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)等检测技术,分别表征了这两种涂层表面的物相组成和显微组织结构。研究结果表明:热喷涂纯Zn涂层A的厚度为281μm,孔隙率约为11.8%,密度约为6.27g·cm~(-3),在自来水中的腐蚀产物主要为Zn_5(CO_3)_2(OH)_6,第一年的腐蚀速度为2.778μm·a~(-1);测定了复合涂层B的厚度为287μm,孔隙率约为7.2%,密度约为6.25 g·cm~(-3),第一年腐蚀速度为1.521μm·a-1。本研究为设计和制备高性能热喷涂Zn防护涂层,并将其应用于钢结构的长效防腐提供必要的理论基础。
The wire flame spraying process was used to design and prepare the thermal spraying pure Zn coating A and the composite coating B with fluorine resin coating and sealing treatment respectively on the Q235 steel substrate surface and separately soaking the two coatings in tap water Corrosion test. The thickness, density, bonding strength and corrosion resistance of the two spray coatings were measured by the methods of magnetic measurement, weighing method, tesla test and weight loss method respectively. The phase composition and microstructure of the two coating surfaces were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results show that the thickness of thermal pure Zn coating A is 281μm, the porosity is about 11.8% and the density is about 6.27g · cm -3. The corrosion products in tap water are mainly Zn_5 (CO_3) _2 OH) _6, the corrosion rate in the first year was 2.778μm · a -1; the thickness of composite coating B was 287μm, the porosity was about 7.2% and the density was about 6.25 g · cm -3 ), The first year the corrosion rate of 1.521μm · a-1. This study provided the necessary theoretical basis for the design and preparation of high performance thermal sprayed Zn protective coating and its application in long-term corrosion protection of steel structures.