Corrosion inhibition of novel phosphates in phenolic resin or rosin-modified phenolic resin

选择酚醛树脂以及酚醛/松香改性酚醛复合树脂,以磷酸锌、三聚磷酸铝APW-I为参照,采用电化学阻抗谱(EIS)考察了含AlZnPO4MoO4·4H2O和AlZn2P3O10(MoO4)2·2H2O两种第二代磷酸盐的涂层在中性3.5%(质量分数)NaCl溶液腐蚀体系中的腐蚀抑制性能,分析了AlZn2P3O10(MoO4)2·2H2O可能的腐蚀失效机制。结合常规的盐水浸泡实验,评价了两种新型磷酸盐颜料在不同涂料中的防腐性能。结果表明:含有改进的聚磷酸盐AlZn2P3O10(MoO4)2·2H2O的酚醛树脂涂层具有一定的自修复作用,中后期阻抗降低较小,展现出更为优异的腐蚀抑制性能;而在酚醛/松香改性酚醛复合树脂中,AlZnPO4MoO4·4H2O的性能更为优异。The corrosion inhibition of two second- generation phosphate pigments AlZnPO4MoO4·4H2O and AlZn2P3O10（MoO4）2·2H2O for the coatings prepared with phenolic resin or rosin-modified phenolic resin in neutral 3.5wt% NaCl solution were studied by electrochemical impedance spectroscopy （EIS） as compared with zinc phosphate and aluminum tripolyphosphate APW-I. The corrosion failure mechanism of AlZn2P3O10（MoO4）2·2H2O was analyzed specially. The anticorrosion properties of the two novel phosphate pigments were evaluated also based on conventional immersion test in the saline water. The results showed that the phenolic resin coating containing AlZn2P3O10（MoO4）2·2H2O has a self-healing capacity and relatively low impedance drop at middle and late stage, showing excellent corrosion inhibition. In the system of rosin-modified phenolic resin, AlZnPO4MoO4·4H2O has superior corrosion inhibition performance.国家自然科学基金项目(20566003);广西民族大学重大项目(2008ZD012);广西科学研究与技术开发计划应用基础研究专项(桂科基0991005,桂科能0992028-13

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies