The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform
Yanxin Qiao - One of the best experts on this subject based on the ideXlab platform.
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Friction stir processing of a cast Manganese-Aluminum Bronze for improving corrosion and cavitation erosion resistances
Surface Topography: Metrology and Properties, 2020Co-Authors: Q.n. Song, Tong Yao, Li Huilin, Yefeng Bao, Li Yin, Yanxin QiaoAbstract:A cast Manganese-Aluminum Bronze (MAB) is subjected to friction stir processing (FSP), and the corrosion and cavitation erosion behaviors are studied. Results indicate that FSP breaks the large-sized κ phases into small particles and remarkably homogenizes and refines the α and β phases in the cast substrate. Therefore, the hardness is raised after FSP. A finer microstructure is obtained by the double-pass FSP. The FSP MABs exhibit higher electrochemical activity than the cast in 3.5 wt% NaCl solution, probably due to the residual stress induced by severe plastic deformation during FSP. However, after long-term immersion, severe localized corrosion occurs and results in the formation of large-size corrosion pits on the cast MAB. By contrast, the FSPed MABs undergoes relatively uniform corrosion and no noticeable pits are found on the double-pass FSPed MAB because of the homogenized microstructure and formation of homogeneous and protective corrosion product films. Under cavitation erosion in 3.5 wt% NaCl solution, the mass loss rate of the FSPed MABs is only half that of the cast. For the cast and FSPed MABs, cavitation transforms the corrosion potential towards a positive direction and raises the corrosion current density by nearly an order of magnitude, and the mechanical impact contributes largely to the cavitation erosion damage. For the cast MAB, severe cleavage fracture occurs at the coarse β phases and large cavities form on the eroded surface. However, the FSPed MABs are evenly and slightly eroded because of the homogeneous microstructure and increased hardness.
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Synergistic effect between cavitation erosion and corrosion for various copper alloys in sulphide-containing 3.5% NaCl solutions
Wear, 2020Co-Authors: Q.n. Song, Tong Yao, Li Huilin, Bao Yefeng, S.y. Sun, Jiang Yongfeng, Z.b. Wang, Yanxin QiaoAbstract:Abstract Cavitation erosion-corrosion (CE-C) behaviour of various copper alloys for ship propellers were investigated in sulphide-containing 3.5% NaCl solutions. Results indicate that the CE-C resistance remarkably decreases with increase in sulphide concentration for cast and friction stir processed nickel-Aluminum Bronzes. CE increases the current density by approximately two orders of magnitude and causes a positive potential shift when the sulphide concentration exceeds 50 ppm. The synergistic effect between CE and corrosion contributes greatly to CE-C degradation in sulphide solutions. However, the CE-C behaviour is insensitive to sulphide concentration for Manganese-Aluminum Bronze and Manganese brass. In all solutions, CE causes a positive potential shift and increases the current density by less than one order of magnitude. Mechanical attack dominates the CE-C damage.
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Effect of Sulfide Concentration on the Corrosion and Cavitation Erosion Behavior of a Manganese-Aluminum Bronze in 3.5% NaCl Solution
Journal of Materials Engineering and Performance, 2019Co-Authors: Q.n. Song, Tong Yao, X. Jiang, Y. Liu, Bao Yefeng, Yanxin QiaoAbstract:The effect of sulfide concentration on the corrosion and cavitation erosion behavior of a cast Manganese-Aluminum Bronze (MAB) alloy in 3.5% NaCl solution was investigated. The electrochemical results showed that when the sulfide concentration exceeded 50 ppm, hydrogen evolution reaction dominated the cathodic process because of the very negative corrosion potential of MAB, and the formation of a copper sulfide film on MAB was a diffusion-controlled process. The mass loss rate of MAB after longer-term immersion was ordered by the sulfide concentration as: 20/50 ppm > 100 ppm > zero > 200 ppm. In the 200 ppm sulfide solution, the mass loss rate of MAB was the lowest, because of the formation of a thin and homogeneous copper sulfide film. In the other sulfide solutions, the formation of a less-protective film with both oxides and sulfides resulted in higher mass loss rate of MAB. Moreover, selective phase corrosion occurred at the β and κ phases in solutions with sulfide addition less than 100 ppm. For all solutions, it was the mechanical attack that dominated cavitation erosion degradation. The cavitation erosion–corrosion synergy was lower in high sulfide solutions, because the corrosion products on MAB could reduce the mechanical impact under cavitation erosion.
Q.n. Song - One of the best experts on this subject based on the ideXlab platform.
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Friction stir processing of a cast Manganese-Aluminum Bronze for improving corrosion and cavitation erosion resistances
Surface Topography: Metrology and Properties, 2020Co-Authors: Q.n. Song, Tong Yao, Li Huilin, Yefeng Bao, Li Yin, Yanxin QiaoAbstract:A cast Manganese-Aluminum Bronze (MAB) is subjected to friction stir processing (FSP), and the corrosion and cavitation erosion behaviors are studied. Results indicate that FSP breaks the large-sized κ phases into small particles and remarkably homogenizes and refines the α and β phases in the cast substrate. Therefore, the hardness is raised after FSP. A finer microstructure is obtained by the double-pass FSP. The FSP MABs exhibit higher electrochemical activity than the cast in 3.5 wt% NaCl solution, probably due to the residual stress induced by severe plastic deformation during FSP. However, after long-term immersion, severe localized corrosion occurs and results in the formation of large-size corrosion pits on the cast MAB. By contrast, the FSPed MABs undergoes relatively uniform corrosion and no noticeable pits are found on the double-pass FSPed MAB because of the homogenized microstructure and formation of homogeneous and protective corrosion product films. Under cavitation erosion in 3.5 wt% NaCl solution, the mass loss rate of the FSPed MABs is only half that of the cast. For the cast and FSPed MABs, cavitation transforms the corrosion potential towards a positive direction and raises the corrosion current density by nearly an order of magnitude, and the mechanical impact contributes largely to the cavitation erosion damage. For the cast MAB, severe cleavage fracture occurs at the coarse β phases and large cavities form on the eroded surface. However, the FSPed MABs are evenly and slightly eroded because of the homogeneous microstructure and increased hardness.
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Synergistic effect between cavitation erosion and corrosion for various copper alloys in sulphide-containing 3.5% NaCl solutions
Wear, 2020Co-Authors: Q.n. Song, Tong Yao, Li Huilin, Bao Yefeng, S.y. Sun, Jiang Yongfeng, Z.b. Wang, Yanxin QiaoAbstract:Abstract Cavitation erosion-corrosion (CE-C) behaviour of various copper alloys for ship propellers were investigated in sulphide-containing 3.5% NaCl solutions. Results indicate that the CE-C resistance remarkably decreases with increase in sulphide concentration for cast and friction stir processed nickel-Aluminum Bronzes. CE increases the current density by approximately two orders of magnitude and causes a positive potential shift when the sulphide concentration exceeds 50 ppm. The synergistic effect between CE and corrosion contributes greatly to CE-C degradation in sulphide solutions. However, the CE-C behaviour is insensitive to sulphide concentration for Manganese-Aluminum Bronze and Manganese brass. In all solutions, CE causes a positive potential shift and increases the current density by less than one order of magnitude. Mechanical attack dominates the CE-C damage.
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Effect of Sulfide Concentration on the Corrosion and Cavitation Erosion Behavior of a Manganese-Aluminum Bronze in 3.5% NaCl Solution
Journal of Materials Engineering and Performance, 2019Co-Authors: Q.n. Song, Tong Yao, X. Jiang, Y. Liu, Bao Yefeng, Yanxin QiaoAbstract:The effect of sulfide concentration on the corrosion and cavitation erosion behavior of a cast Manganese-Aluminum Bronze (MAB) alloy in 3.5% NaCl solution was investigated. The electrochemical results showed that when the sulfide concentration exceeded 50 ppm, hydrogen evolution reaction dominated the cathodic process because of the very negative corrosion potential of MAB, and the formation of a copper sulfide film on MAB was a diffusion-controlled process. The mass loss rate of MAB after longer-term immersion was ordered by the sulfide concentration as: 20/50 ppm > 100 ppm > zero > 200 ppm. In the 200 ppm sulfide solution, the mass loss rate of MAB was the lowest, because of the formation of a thin and homogeneous copper sulfide film. In the other sulfide solutions, the formation of a less-protective film with both oxides and sulfides resulted in higher mass loss rate of MAB. Moreover, selective phase corrosion occurred at the β and κ phases in solutions with sulfide addition less than 100 ppm. For all solutions, it was the mechanical attack that dominated cavitation erosion degradation. The cavitation erosion–corrosion synergy was lower in high sulfide solutions, because the corrosion products on MAB could reduce the mechanical impact under cavitation erosion.
Tong Yao - One of the best experts on this subject based on the ideXlab platform.
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Friction stir processing of a cast Manganese-Aluminum Bronze for improving corrosion and cavitation erosion resistances
Surface Topography: Metrology and Properties, 2020Co-Authors: Q.n. Song, Tong Yao, Li Huilin, Yefeng Bao, Li Yin, Yanxin QiaoAbstract:A cast Manganese-Aluminum Bronze (MAB) is subjected to friction stir processing (FSP), and the corrosion and cavitation erosion behaviors are studied. Results indicate that FSP breaks the large-sized κ phases into small particles and remarkably homogenizes and refines the α and β phases in the cast substrate. Therefore, the hardness is raised after FSP. A finer microstructure is obtained by the double-pass FSP. The FSP MABs exhibit higher electrochemical activity than the cast in 3.5 wt% NaCl solution, probably due to the residual stress induced by severe plastic deformation during FSP. However, after long-term immersion, severe localized corrosion occurs and results in the formation of large-size corrosion pits on the cast MAB. By contrast, the FSPed MABs undergoes relatively uniform corrosion and no noticeable pits are found on the double-pass FSPed MAB because of the homogenized microstructure and formation of homogeneous and protective corrosion product films. Under cavitation erosion in 3.5 wt% NaCl solution, the mass loss rate of the FSPed MABs is only half that of the cast. For the cast and FSPed MABs, cavitation transforms the corrosion potential towards a positive direction and raises the corrosion current density by nearly an order of magnitude, and the mechanical impact contributes largely to the cavitation erosion damage. For the cast MAB, severe cleavage fracture occurs at the coarse β phases and large cavities form on the eroded surface. However, the FSPed MABs are evenly and slightly eroded because of the homogeneous microstructure and increased hardness.
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Synergistic effect between cavitation erosion and corrosion for various copper alloys in sulphide-containing 3.5% NaCl solutions
Wear, 2020Co-Authors: Q.n. Song, Tong Yao, Li Huilin, Bao Yefeng, S.y. Sun, Jiang Yongfeng, Z.b. Wang, Yanxin QiaoAbstract:Abstract Cavitation erosion-corrosion (CE-C) behaviour of various copper alloys for ship propellers were investigated in sulphide-containing 3.5% NaCl solutions. Results indicate that the CE-C resistance remarkably decreases with increase in sulphide concentration for cast and friction stir processed nickel-Aluminum Bronzes. CE increases the current density by approximately two orders of magnitude and causes a positive potential shift when the sulphide concentration exceeds 50 ppm. The synergistic effect between CE and corrosion contributes greatly to CE-C degradation in sulphide solutions. However, the CE-C behaviour is insensitive to sulphide concentration for Manganese-Aluminum Bronze and Manganese brass. In all solutions, CE causes a positive potential shift and increases the current density by less than one order of magnitude. Mechanical attack dominates the CE-C damage.
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Effect of Sulfide Concentration on the Corrosion and Cavitation Erosion Behavior of a Manganese-Aluminum Bronze in 3.5% NaCl Solution
Journal of Materials Engineering and Performance, 2019Co-Authors: Q.n. Song, Tong Yao, X. Jiang, Y. Liu, Bao Yefeng, Yanxin QiaoAbstract:The effect of sulfide concentration on the corrosion and cavitation erosion behavior of a cast Manganese-Aluminum Bronze (MAB) alloy in 3.5% NaCl solution was investigated. The electrochemical results showed that when the sulfide concentration exceeded 50 ppm, hydrogen evolution reaction dominated the cathodic process because of the very negative corrosion potential of MAB, and the formation of a copper sulfide film on MAB was a diffusion-controlled process. The mass loss rate of MAB after longer-term immersion was ordered by the sulfide concentration as: 20/50 ppm > 100 ppm > zero > 200 ppm. In the 200 ppm sulfide solution, the mass loss rate of MAB was the lowest, because of the formation of a thin and homogeneous copper sulfide film. In the other sulfide solutions, the formation of a less-protective film with both oxides and sulfides resulted in higher mass loss rate of MAB. Moreover, selective phase corrosion occurred at the β and κ phases in solutions with sulfide addition less than 100 ppm. For all solutions, it was the mechanical attack that dominated cavitation erosion degradation. The cavitation erosion–corrosion synergy was lower in high sulfide solutions, because the corrosion products on MAB could reduce the mechanical impact under cavitation erosion.
Bao Yefeng - One of the best experts on this subject based on the ideXlab platform.
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Synergistic effect between cavitation erosion and corrosion for various copper alloys in sulphide-containing 3.5% NaCl solutions
Wear, 2020Co-Authors: Q.n. Song, Tong Yao, Li Huilin, Bao Yefeng, S.y. Sun, Jiang Yongfeng, Z.b. Wang, Yanxin QiaoAbstract:Abstract Cavitation erosion-corrosion (CE-C) behaviour of various copper alloys for ship propellers were investigated in sulphide-containing 3.5% NaCl solutions. Results indicate that the CE-C resistance remarkably decreases with increase in sulphide concentration for cast and friction stir processed nickel-Aluminum Bronzes. CE increases the current density by approximately two orders of magnitude and causes a positive potential shift when the sulphide concentration exceeds 50 ppm. The synergistic effect between CE and corrosion contributes greatly to CE-C degradation in sulphide solutions. However, the CE-C behaviour is insensitive to sulphide concentration for Manganese-Aluminum Bronze and Manganese brass. In all solutions, CE causes a positive potential shift and increases the current density by less than one order of magnitude. Mechanical attack dominates the CE-C damage.
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Effect of Sulfide Concentration on the Corrosion and Cavitation Erosion Behavior of a Manganese-Aluminum Bronze in 3.5% NaCl Solution
Journal of Materials Engineering and Performance, 2019Co-Authors: Q.n. Song, Tong Yao, X. Jiang, Y. Liu, Bao Yefeng, Yanxin QiaoAbstract:The effect of sulfide concentration on the corrosion and cavitation erosion behavior of a cast Manganese-Aluminum Bronze (MAB) alloy in 3.5% NaCl solution was investigated. The electrochemical results showed that when the sulfide concentration exceeded 50 ppm, hydrogen evolution reaction dominated the cathodic process because of the very negative corrosion potential of MAB, and the formation of a copper sulfide film on MAB was a diffusion-controlled process. The mass loss rate of MAB after longer-term immersion was ordered by the sulfide concentration as: 20/50 ppm > 100 ppm > zero > 200 ppm. In the 200 ppm sulfide solution, the mass loss rate of MAB was the lowest, because of the formation of a thin and homogeneous copper sulfide film. In the other sulfide solutions, the formation of a less-protective film with both oxides and sulfides resulted in higher mass loss rate of MAB. Moreover, selective phase corrosion occurred at the β and κ phases in solutions with sulfide addition less than 100 ppm. For all solutions, it was the mechanical attack that dominated cavitation erosion degradation. The cavitation erosion–corrosion synergy was lower in high sulfide solutions, because the corrosion products on MAB could reduce the mechanical impact under cavitation erosion.
X. Jiang - One of the best experts on this subject based on the ideXlab platform.
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Effect of Sulfide Concentration on the Corrosion and Cavitation Erosion Behavior of a Manganese-Aluminum Bronze in 3.5% NaCl Solution
Journal of Materials Engineering and Performance, 2019Co-Authors: Q.n. Song, Tong Yao, X. Jiang, Y. Liu, Bao Yefeng, Yanxin QiaoAbstract:The effect of sulfide concentration on the corrosion and cavitation erosion behavior of a cast Manganese-Aluminum Bronze (MAB) alloy in 3.5% NaCl solution was investigated. The electrochemical results showed that when the sulfide concentration exceeded 50 ppm, hydrogen evolution reaction dominated the cathodic process because of the very negative corrosion potential of MAB, and the formation of a copper sulfide film on MAB was a diffusion-controlled process. The mass loss rate of MAB after longer-term immersion was ordered by the sulfide concentration as: 20/50 ppm > 100 ppm > zero > 200 ppm. In the 200 ppm sulfide solution, the mass loss rate of MAB was the lowest, because of the formation of a thin and homogeneous copper sulfide film. In the other sulfide solutions, the formation of a less-protective film with both oxides and sulfides resulted in higher mass loss rate of MAB. Moreover, selective phase corrosion occurred at the β and κ phases in solutions with sulfide addition less than 100 ppm. For all solutions, it was the mechanical attack that dominated cavitation erosion degradation. The cavitation erosion–corrosion synergy was lower in high sulfide solutions, because the corrosion products on MAB could reduce the mechanical impact under cavitation erosion.