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Cutting fluid corrosion inhibitors from inorganic to organic: Progress and applications
Haogang Li,Yanbin Zhang,Changhe Li,Zongming Zhou,Xiaolin Nie,Yun Chen,Huajun Cao,Bo Liu,Naiqing Zhang,Zafar Said,Sujan Debnath,Muhammad Jamil,Hafiz Muhammad Ali,Shubham Sharma 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5
Water-based cutting fluid has a broad application area and a hundred year history, but its poor corrosioninhibition and anti-rust ability limit its further promotion. Adding corrosion inhibitors can effectively solve the aboveproblems. However, no review papers are available on cutting fluid corrosion inhibitors, and their mechanism, suitability,and performance influencing factors have not been revealed. This article discusses cutting fluid corrosion inhibitorsto fill the gaps in theoretical research and industrial applications. Inorganic matters are initially used in corrosion inhibitiondue to their strong oxidizing properties. Therefore, the film formation mechanism of inorganic corrosion inhibitoroxide and precipitation film is first analyzed, and the applications in corrosive medium are summarized. Given thatinorganic corrosion inhibitors are not environmentally friendly and expensive, organic corrosion inhibitors are currentlyused as replacement. Thus, the film formation mechanism of different organic corrosion inhibitors adsorptionfilm is analyzed, and their suitability with metals is determined. The influence of molecular structure and temperatureon their corrosion inhibition effect is also studied, and the performance of inorganic and organic corrosion inhibitors iscompared. However, single organic corrosion inhibitors are greatly affected by metal surface state, temperature, andimmersion time. Therefore, the synergistic film formation after the compounding of organic and inorganic corrosioninhibitors is analyzed. In addition, the influence rate of concentration, molecular structure, and temperature on corrosioninhibition performance is revealed, and a matching database of corrosion inhibitor type and metal type in cuttingis established. Finally, in view of the limitations of cutting fluid corrosion inhibitors, the establishment of a moleculardynamics model of corrosion inhibitor failure and accelerates corrosion and the development of general-purpose greenadditives based on the molecular design and physical and chemical analysis of the suitability of corrosion inhibitor andbase liquid are prospected.
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Sui, Shiyan,Jia, Yimin,He, Bin,Li, Runsheng,Li, Xian,Cai, Demin,Song, Haogang,Zhang, Rongkui,Zhao, Ruqian Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.12
Maternal malnutrition during pregnancy may give rise to female offspring with disrupted ovary functions in adult age. Neonatal ovary development predisposes adult ovary function, yet the effect of maternal nutrition on the neonatal ovary has not been described. Therefore, here we show the impact of maternal protein restriction on the expression of folliculogenic and steroidogenic genes, their regulatory microRNAs and promoter DNA methylation in the ovary of neonatal piglets. Sows were fed either standard-protein (SP, 15% crude protein) or low-protein (LP, 7.5% crude protein) diets throughout gestation. Female piglets born to LP sows showed significantly decreased ovary weight relative to body weight (p<0.05) at birth, which was accompanied with an increased serum estradiol level (p<0.05). The LP piglets demonstrated higher ratio of bcl-2 associated X protein/B cell lymphoma/leukemia-2 mRNA (p<0.01), which was associated with up-regulated mRNA expression of bone morphogenic protein 4 (BMP4) (p<0.05) and proliferating cell nuclear antigen (PCNA) (p<0.05). The steroidogenic gene, cytochrome P450 aromatase (CYP19A1) was significantly down-regulated (p<0.05) in LP piglets. The alterations in ovarian gene expression were associated with a significant down-regulation of follicle-stimulating hormone receptor mRNA expression (p<0.05) in LP piglets. Moreover, three microRNAs, including miR-423-5p targeting both CYP19A1 and PCNA, miR-378 targeting CYP19A1 and miR-210 targeting BMP4, were significantly down-regulated (p<0.05) in the ovary of LP piglets. These results suggest that microRNAs are involved in mediating the effect of maternal protein restriction on ovarian function through regulating the expression of folliculogenic and steroidogenic genes in newborn piglets.
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