Peculiarities of zinc coating corrosion in neutral environments with inhibitors based on benzotriazole, cyclohexylamine and morpholine

O. Kanunnikova, V. Aksenova, B. Pushkarev, V. Ladyanov
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Abstract

The influence of domestic VNKh-L type nitrogen-containing corrosion inhibitors on the corrosion patterns of zinc coating on steel in a neutral environment was investigated. The paper aims to study the structure of the corroding zinc coating surface, as well as the influence of conditions simulating the degradation of inhibitors under actual application conditions on their protective properties. Mechanical activation in a ball planetary mill was used to simulate the thermal and deformation conditions of inhibitors. Zinc coating corrosion on steel was carried out in a sulfate-chloride environment simulating atmospheric corrosion and in borate buffer solution. The concentration of inhibitors in corrosion environments was 0,2 wt.%. The corroded surface morphology of the zinc coating was studied using the Philips SEM-515 scanning electron microscope (at an accelerating voltage of 10 kV) with an X-ray micro probe. Studies of the zinc coating corrosion rate on St 08 were carried out by the indirect measurement of corrosion resistance using the MONIKOR-1 corrosion meter. Borate buffer solution (Na2B4O7 + H3BO3, pH = 6,6) and the solution simulating atmospheric corrosion (NaCl + + Na2SO4, pH = 6,0) were used as corrosive environments. The corrosion rate of samples in corrosive environments without inhibitors was taken as 1. Exposure time of each sample in corrosive environments was 3 h. The chemical composition of corrosion products was studied by mirror reflection in the IR range. The IR spectra of metal plate surfaces were recorded on the FSM-1202 IR Fourier spectrometer in a wavelength range of 450–4000 cm–1 with a resolution of 2 cm–1 and an accumulation of 100 scans. A mirror reflection attachment with a 10° angle of incidence was used to obtain reflection spectra. The zinc coating corrosion rate in sulfate-chloride and borate environments in the presence of inhibitors based on benzotriazole and cyclohexylamine was virtually not reduced compared to the corrosion rate in the same environments without inhibitors. When both initial and mechanically activated inhibitors based on morpholine and benzotriazole are added to the corrosion environment, the iron corrosion rate decreases compared to the corrosion rate in the same environments without inhibitors. In the presence of initial and mechanically activated inhibitors of both groups, pitting corrosion of the zinc coating in the studied corrosion environments is observed. At the same time, the pitting depth under corrosion conditions is less than the zinc coating thickness.
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苯并三唑、环己胺和啉类缓蚀剂对中性环境下锌镀层腐蚀的特性
研究了国产VNKh-L型含氮缓蚀剂在中性环境下对钢锌镀层腐蚀模式的影响。本文旨在研究腐蚀锌涂层表面的结构,以及模拟抑制剂在实际应用条件下降解的条件对其防护性能的影响。采用球磨机机械活化法模拟了阻垢剂的热和变形情况。在模拟大气腐蚀的硫酸盐-氯化物环境和硼酸盐缓冲溶液中对钢锌层进行了腐蚀试验。缓蚀剂在腐蚀环境中的浓度为0.2%。采用飞利浦SEM-515扫描电子显微镜(加速电压为10 kV)和x射线微探针研究了锌涂层的腐蚀表面形貌。采用MONIKOR-1型腐蚀仪间接测定了St 08的耐蚀性,研究了锌镀层的腐蚀速率。采用硼酸盐缓冲溶液(Na2B4O7 + H3BO3, pH = 6,6)和模拟大气腐蚀溶液(NaCl + + Na2SO4, pH = 6,0)作为腐蚀环境。取样品在无抑制剂腐蚀环境中的腐蚀速率为1。每个样品在腐蚀环境中的暴露时间为3h。腐蚀产物的化学成分通过红外范围内的镜面反射来研究。在FSM-1202型红外傅立叶光谱仪上记录了金属板表面的红外光谱,波长范围为450-4000 cm-1,分辨率为2 cm-1,扫描次数为100次。采用入射角为10°的镜面反射附件获得反射光谱。在氯化物硫酸盐和硼酸盐环境中,与没有抑制剂的环境相比,在含有苯并三唑和环己胺抑制剂的环境中,锌涂层的腐蚀速率实际上没有降低。当在腐蚀环境中加入初始和基于啉和苯并三唑的机械活化抑制剂时,与在相同环境中不添加抑制剂的腐蚀速率相比,铁的腐蚀速率降低。在两组初始和机械活化抑制剂的存在下,在研究的腐蚀环境中观察到锌涂层的点蚀。同时,腐蚀条件下的点蚀深度小于镀锌层厚度。
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