Chunyan Zhang , Yuyang Chen , Baoxing Yu , Peng Zhou , Yunfei Zhai , Yan Chen , Xiaochen Zhang , Tao Zhang , Fuhui Wang
{"title":"Effects of nucleation pretreatment on corrosion resistance of conversion coating on magnesium alloy Mg-10Gd-3Y-0.4Zr","authors":"Chunyan Zhang , Yuyang Chen , Baoxing Yu , Peng Zhou , Yunfei Zhai , Yan Chen , Xiaochen Zhang , Tao Zhang , Fuhui Wang","doi":"10.1016/j.corcom.2022.10.001","DOIUrl":"https://doi.org/10.1016/j.corcom.2022.10.001","url":null,"abstract":"<div><p>To improve corrosion resistance of phosphate chemical conversion coatings (PCCs) on magnesium alloy Mg-10Gd-3Y-0.4Zr, a new route was proposed. The phosphate conversion treatment was preceded by two nucleation pretreatment processes in the form of physical adhesion and chemical adsorption. The present study focused on the effects of two nucleation pretreatments of silane coupling agent KH-550 + nano-SiO<sub>2</sub> sol process and Ti/Zr surface modification treatment on microstructure and corrosion resistance of PCCs on magnesium alloy Mg-10Gd-3Y-0.4Zr. Results demonstrate that nucleation pretreatment can prefabricate dispersed nuclei on substrate's surface, which significantly enhances the nucleation rate during the initial stage of coating formation, and decreases the crystal size of PCCs. Corrosion resistance of the PPCs was increased by a factor of 4. The Ti/Zr pretreatment demonstrates a superior application perspective due to the ease-of-fabrication and simplicity.</p></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"10 ","pages":"Pages 69-79"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigating the corrosion resistance of Cu-doped Ni-Mo low alloy steel through electrochemical tests","authors":"Tianyi Zhang, Wei Liu, Yipu Sun, Baojun Dong, Weijian Yang, Longjun Chen","doi":"10.1016/j.corcom.2022.12.001","DOIUrl":"https://doi.org/10.1016/j.corcom.2022.12.001","url":null,"abstract":"<div><p>Corrosion resistance of Cu-doped Ni-Mo low alloy steel (Ni-Mo steel) in marine environments was systematically investigated through microstructure observation and galvanostatic polarization tests. Results show that solid solution Cu improved the corrosion thermodynamic stability of steel. The increasing Cu content promoted the formation of Cu-rich precipitates, martensite-austenite island, granular bainitic and high angle grain boundary, increasing the surface potential difference and the occurrence probability of local galvanic corrosion on steel surface. The addition of Cu improved the protectiveness of corrosion product film after galvanostatic polarization tests relying on the functions of CuFeO<sub>2</sub> and CuO, whose formation was mainly related to the solid solution Cu in Ni-Mo steel.</p></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"10 ","pages":"Pages 10-26"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yingxiang Ma , Dan Jiang , Yuping Yang , Li Ma , Jian Zhou , Guosheng Huang , Cunguo Lin
{"title":"Synthesis of magnetic targeted delivery microcapsules and its anti-corrosion self-healing behavior in epoxy resin coatings","authors":"Yingxiang Ma , Dan Jiang , Yuping Yang , Li Ma , Jian Zhou , Guosheng Huang , Cunguo Lin","doi":"10.1016/j.corcom.2022.08.004","DOIUrl":"https://doi.org/10.1016/j.corcom.2022.08.004","url":null,"abstract":"<div><p>This study proposed a tung-oil based magnetic targeted delivery microcapsules (MDTMs) to enhance the efficiency of self-healing coatings (SHC). Magnetic particles were used as function particles and emulsifier in synthesis of microcapsules (MC). DSC, OM, SEM, TEM, VSM, NSS, EIS and SKP were used to characterize the compounds, structure, healing behavior and anti-corrosion performance. Results indicate that magnetically driven SHC (MD-SHC) reduces 50% migration path of the released tung oil, and increases the release rate of tung oil after the coating is mechanically damaged. SKP and EIS results suggest that the healing part has impressive anti-corrosion performance, scratches were filled with a large amount of tung oil in a short time, and the released tung oil had formed a complete oil film on scratches at 24 h with higher polarization resistance (<em>R</em><sub>p</sub>). <em>R</em><sub>p</sub> of MD-SHC (2.5 × 10<sup>5</sup>–3.6 × 10<sup>5</sup> Ω cm<sup>2</sup>) is 2.0–2.8 times of that the SHC (1.1 × 10<sup>5</sup>–1.8 × 10<sup>5</sup> Ω cm<sup>2</sup>). The enrichment in MD-SHC at the interface decreases bonding strength from 7 to 4.5 MPa as the mass additive of microcapsules reaches 15 wt.%. The current work proves the effectiveness of MD-SHC in improving self-healing ability.</p></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"10 ","pages":"Pages 27-37"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hao Liu , Jiabo Chen , Shuai Wang , Bo Du , Fahe Cao , Qingqing Sun
{"title":"Microstructure, thermal stability and corrosion behavior of ultrasonic shot peened AA7034","authors":"Hao Liu , Jiabo Chen , Shuai Wang , Bo Du , Fahe Cao , Qingqing Sun","doi":"10.1016/j.corcom.2022.09.003","DOIUrl":"https://doi.org/10.1016/j.corcom.2022.09.003","url":null,"abstract":"<div><p>Microstructure, thermal stability at room temperature and corrosion behavior of ultrasonic shot peened AA7034 were investigated in this work. Microstructure modification induced by ultrasonic shot peening was obtained by using OM, SEM, EBSD and XRD, and it was found that a ∼200 μm thick gradient surface layer with nano-scale grains on the topmost layer was induced on the peened sample. XRD peaks of the pre-existing aging-induced precipitates, i.e., <em>η</em>′ and <em>η</em> phases, disappeared after peening and did not show up during 52 months-long natural aging treatment, showing good thermal stability at room temperature. After peening, a significant improvement in intergranular corrosion resistance is evident. Electrochemical characterizations like open circuit potential and electrochemical impedance spectroscopy were conducted on various depths of the peened sample and the results indicated that uniform corrosion rate was largely accelerated by the presence of foreign Fe-rich contamination, implying that modifications should be made to reduce/avoid the foreign contamination. Additionally, mechanisms of corrosion improvement and good thermal stability of the nanocrystalline surface layer of AA7304 are also discussed.</p></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"10 ","pages":"Pages 48-55"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qiancheng Zhao , Xuefei Wang , Zhimin Pan , Ya Wei , Hongxu Cheng , Yicong Ma , Hong Luo , Xiaogang Li
{"title":"Effects of rare earth elements addition on mechanical properties and corrosion behavior of GCr15 bearing steel under different heat treatment conditions","authors":"Qiancheng Zhao , Xuefei Wang , Zhimin Pan , Ya Wei , Hongxu Cheng , Yicong Ma , Hong Luo , Xiaogang Li","doi":"10.1016/j.corcom.2022.06.004","DOIUrl":"https://doi.org/10.1016/j.corcom.2022.06.004","url":null,"abstract":"<div><p>In this work, effects of rare earth addition on mechanical properties and corrosion behavior of GCr15 bearing steel under hot rolled, annealed, and quenched-tempered conditions were investigated via mechanical tests, electrochemical measurements, and immersion tests. Results show that rare earth elements can refine grains, improve hardness, tensile strength, and impact absorption energy of GCr15 bearing steel under different heat treatment conditions. Besides, it has been found that rare earth elements are beneficial to corrosion resistance of GCr15 bearing steel in 0.1 mol/L NaCl solution by electrochemical and immersion measurements.</p></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"9 ","pages":"Pages 65-76"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xinyu Pan , Xiaohu Luo , Ji Li , Xiaoping Zhang , Xihong Yu , Chengliang Zhou , Bo Chen , Yali Liu
{"title":"Superhydrophobicity and high corrosion resistance of secondary alkane sulphonate (SAS) modified Li-Al LDH film in-situ grown on aluminum alloy","authors":"Xinyu Pan , Xiaohu Luo , Ji Li , Xiaoping Zhang , Xihong Yu , Chengliang Zhou , Bo Chen , Yali Liu","doi":"10.1016/j.corcom.2022.05.005","DOIUrl":"https://doi.org/10.1016/j.corcom.2022.05.005","url":null,"abstract":"<div><p>In this work, a secondary alkane sulfonate (SAS) modified Li-Al LDH film (SLDH) with high corrosion resistance by a simple in-situ growth on aluminium alloy 6N01. Water contact angle (WCA) and scanning electron microscopy (SEM) revealed that the film was fabricated with a flower-shaped microstructure and highly superhydrophobic performance (WCA=153°). XRD patterns and FTIR spectrum revealed that SAS species were intercalated into SLDH. X-ray photoelectron spectroscopy (XPS) analysis indicated that SLDH was mainly composed of C, O, S, Al and Li. Potentiodynamic polarization (PDP) curves proved that SLDH (<em>i</em><sub>corr</sub> = 9.169 × 10<sup>−8</sup> A/cm<sup>2</sup>) provided pronounced protection than that of CLDH (<em>i</em><sub>corr</sub> = 9.011 × 10<sup>−7</sup> A/cm<sup>2</sup>), and electrochemical impedance spectra (EIS) demonstrated that corrosion resistance was improved. Neutral salt spray (NSS) tests exhibited that compared to CLDH with severe pitting corrosion, SLDH was virtually undamaged after 360 h exposure. Based on the above results, a sound inhibition mechanism of SLDH was inferred to be a dual effect, including the barrier action of superhydrophobic surface and the ion exchange of intercalated SAS with aggressive chlorides. In conclusion, the special divergent long-chain structure of SAS with low surface energy results in the superhydrophobicity of SLDH.</p></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"9 ","pages":"Pages 27-35"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zachariah Pulluparampil Mathew , G.K. Shamnamol , K.P. Greeshma , Sam John
{"title":"Insight on the corrosion inhibition of nanocomposite chitosan/boron nitride integrated epoxy coating system against mild steel","authors":"Zachariah Pulluparampil Mathew , G.K. Shamnamol , K.P. Greeshma , Sam John","doi":"10.1016/j.corcom.2022.09.001","DOIUrl":"https://doi.org/10.1016/j.corcom.2022.09.001","url":null,"abstract":"<div><p>Research in the field of organic and inorganic corrosion inhibitors has become prominent in recent years whereas its applicability is limited owing to the toxicity, non-biodegradability, low inhibition efficiency, etc. Polymer nanocomposites have high mechanical strength, stiffness, toughness, and thermal stability. They act as barriers against moisture and gases which enhance their applicability to various fields. The present study focuses on the synthesis of nanocomposite of chitosan/boron nitride (CS-BN) by sol-gel process and incorporated into epoxy matrix. The composite is then characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). XRD results show that nano hexagonal boron nitrides are finely scattered in the chitosan matrix. The thermal stability of the CS-BN composite was studied with TGA. The study depicts that boron nitride increases the thermal stability of chitosan. The corrosion protection features of biocompatible chitosan/boron nitride nanocomposite on mild steel (MS) substrate in 1 mol/L HCl solution were monitored by potentiodynamic polarization studies (Tafel), electrochemical impedance spectroscopy (EIS), and linear polarization studies (LPS). X-ray photoelectron spectroscopy (XPS) analysis was adopted to propose the mechanism of corrosion and also used to compare the corrosion inhibition behavior of BN in composite on MS surface.</p></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"9 ","pages":"Pages 36-43"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuan Zhang , Xian Zhang , Siyu Chen , Jing Liu , Teng Li , Lingyu Wang , Kaiming Wu
{"title":"Corrosion behavior and passive film properties of nickel-based alloy in phosphoric acid","authors":"Yuan Zhang , Xian Zhang , Siyu Chen , Jing Liu , Teng Li , Lingyu Wang , Kaiming Wu","doi":"10.1016/j.corcom.2022.06.003","DOIUrl":"https://doi.org/10.1016/j.corcom.2022.06.003","url":null,"abstract":"<div><p>Corrosion behavior and passive film properties of nickel-based alloy (Inconel 625) in phosphoric acid were investigated, by means of a variety of electrochemical methods combined with surface analysis techniques. Results showed that Inconel 625 exhibited strong passive behavior in phosphoric acid but their corrosion resistance was deteriorated with increasing concentration of phosphoric acid. The increasing concentration of phosphoric acid also accelerated the corrosion rate. The passive film of Inconel 625 was composed of an inner layer rich in Cr<sub>2</sub>O<sub>3</sub> and an outer layer rich in FeOOH. The initial corrosion of Inconel 625 in phosphoric acid originated from the complex inclusions composed of N, Nb and Ti with a corn rich in Mg and O. At concentrations lower than 1 mol/L, inner layer of the passive film remained intact and only the outer layer was damaged. At concentrations of phosphoric acid higher than 1 mol/L, both the inner and outer layers were destroyed. The insoluble corrosion products Fe phosphate compounds precipitated on the surface of Inconel 625, which accumulated with increasing concentrations of phosphoric acid and became a loose layer covering the surface of Inconel 625 at concentrations of phosphoric acid higher than 1 mol/L.</p></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"9 ","pages":"Pages 77-88"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49711840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}