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α-Zirconium orthophosphate as a new Zn-free anticorrosive pigment in organic coatings
Journal of Solid State Electrochemistry ( IF 2.5 ) Pub Date : 2020-11-12 , DOI: 10.1007/s10008-020-04862-1
I. Bouali , E. Rocca , D. Veys-Renaux , A. Khalil , B. Rhouta , A. Ait Aghzzaf

In the framework of the anticorrosive pigment research without heavy metals like zinc or chromium, a new lamellar phosphate pigment, namely zirconium orthophosphate Zr(HPO4)2·H2O, was prepared by a simple precipitation route and dispersed in an organic resin coating at 5 wt.%. After characterization by electronic microscopy, X-ray diffraction and thermogravimetry, its use as a corrosion inhibitor pigment was investigated in 0.5 M NaCl corrosive media on steel and zinc. Electrochemical impedance spectroscopy measurements show that the delamination ratio of the ZrP-loaded organic coating is considerably reduced with immersion time, even though ZrP addition lowers the bulk coating resistivity. In comparison with classical aluminium triphosphate pigments, these particular high performances are related to the specific structure and physicochemical properties of ZrP materials. On the one hand, the acidity character of ZrP due to proton lability allows the control of the pH at the metal/coating interface. On the other hand, the progressive dissolution of ZrP pigments induces the formation of insoluble protective metallic phosphates and ZrO2 on zinc and steel substrates, as revealed by solution analysis (ICP-MS).



中文翻译:

α-正磷酸锆作为有机涂料中的新型无锌防腐颜料

在不含锌或铬等重金属的防腐颜料研究框架内,一种新型的层状磷酸盐颜料,即正磷酸锆Zr(HPO 42 ·H 2通过简单的沉淀途径制备O,并以5重量%分散在有机树脂涂层中。通过电子显微镜,X射线衍射和热重分析法表征后,在钢和锌上的0.5 M NaCl腐蚀性介质中研究了其作为缓蚀剂的用途。电化学阻抗谱测量结果表明,即使添加ZrP会降低整体涂层的电阻率,但随着浸入时间的延长,ZrP负载有机涂层的分层率也会大大降低。与传统的三磷酸铝颜料相比,这些特殊的高性能与ZrP材料的特定结构和理化特性有关。一方面,由于质子不稳定性导致的ZrP的酸性特征可以控制金属/涂层界面的pH值。另一方面,如溶液分析(ICP-MS)所示,在锌和钢基材上具有2

更新日期:2020-11-13
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