海洋環(huán)境躍變區(qū)碳鋼腐蝕行為與機(jī)理研究
[Abstract]:There are many interfaces in the marine environment, such as the sea water-sea-air exchange interface, the seawater-sea mud exchange interface, the ocean temperature jump layer and so on. In the area of environmental jump, the speed of chemical reaction, the reaction mechanism and the body system have a large phase difference, which cause the attention and research interest of many researchers. Metallic materials used in the marine environment, in or throughout the marine environment. The research of the corrosion of the metal in the marine environment of the marine environment is confined to the sea-sea-gas jump area, and the corrosion of the metal in the sea-sea mud jump area is very little concerned, and the corrosion of the metal in the sea-sea-sea-jump area is not involved. Based on the sea-sea-sea-gas exchange interface, the sea-sea mud exchange interface and the marine temperature-jump layer as the environmental background, the carbon steel Q235, the pipeline steel x70 and the screw steel HRB400 are used as the research material, and the improved array electrode technology is utilized. The corrosion behavior and mechanism of carbon steel in the marine environment are studied systematically. The results show that the carbon steel in the seawater-sea-air interface region has serious corrosion, and the carbon steel in the vertical seawater-sea-air interface has two corrosion current peaks, one in the water line area and the other in the seawater area near the sea-sea interface. In the initial stage of the immersion, the carbon steel is dominated by the formation of micro-corrosion cells; after 15 days in the immersion test, the carbon steel is dominated by a macro-corrosion cell formed between the atmospheric region and the seawater immersion region. In different regions, the corrosion mechanism of carbon steel is different, and the main reason for the difference of corrosion mechanism is that the concentration difference of the dissolved oxygen and the compactness of the corrosion products on the surface of the carbon steel are different. The carbon steel in the seawater-sea mud interface area forms a significant macro-corrosion cell, and the anode area is concentrated in the sea mud area at a certain distance under the seawater-sea mud interface, and the seawater area is the cathode area. The current difference between the anode and the cathode is stable at about 1000 nA for a long time. The carbon steel passing through the interface area of the sea-sea mud has two corrosion current peaks, which are the sea mud area of the near-sea-sea mud interface area and the seawater area of the far-sea-sea mud interface area, respectively. The density of the corrosion products on the surface of the carbon steel in the seawater-sea mud interface area is positively related to the dissolved oxygen. The corrosion of the carbon steel in the interface area of the sea-sea mud is not only influenced by the effect of the macro-corrosion cell formed by the potential difference, but also the influence of the dissolved oxygen concentration, the sea mud impedance and other factors. The X70 steel, which runs through the simulated seawater temperature jump layer, forms a clear macro-corrosion cell. In the initial stage of the immersion, the lower zone is the cathode, the upper part is the anode, and the anode and the cathode are reversed with the prolonging of the soaking time. The corrosion rate of X70 steel at the upper part of the temperature-jump layer is higher than that of the lower part. The corrosion rate of X70 steel at the lower part of the temperature-jump layer is 60 mg 路 cm-2 路 y-1, while the corrosion rate of X70 steel at the upper part of the thermocline is 100mg 路 cm-2 路 y-1. The corrosion of X70 steel at the lower part of the thermocline is mainly affected by the macro-corrosion cell, and the corrosion of X70 steel in the upper part of the temperature-jump layer is mainly affected by the dissolved oxygen. The corrosion rate of the steel bars in the interface area of the seawater full-soaking area and the tide-difference area is the largest in the electric connection column through the seawater splash area, the tide difference area and the bare steel bar in the full-dip area. the seawater full-soaking area is an anode, and the tidal zone is a cathode, and a macro-corrosion battery is formed. In the non-electrically connected column, the corrosion rate of the steel bars in the tidal zone is the largest. The bare steel bars passing through the seawater splash area, the tidal zone and the full immersion area, the electrical connection column is less corrosion than the non-electric connecting column, and the corrosion is more uniform. In the concrete of the seawater splash zone, the tidal zone and the full-dip zone, the area of the corrosion occurs first in the seawater full-dip zone and then to the tidal zone and finally to the splash zone. The corrosion of concrete reinforcement in the simulated marine environment is controlled by oxygen diffusion and salt penetration. the rate of the salt ion penetration and the oxygen diffusion rate of the concrete in the jump zone of the different simulated marine environment are different, and the concrete in the splash zone has the highest salt ion penetration rate and the oxygen diffusion rate: in the tidal zone and the splash zone, the transmission mechanism of the chloride ions in the mixed-gel ten protection layer is the co-action of the concentrated difference diffusion and the dry concentration in the dry-wet cycle, The transmission mechanism of the chloride ion in the mixed concrete in the above transition zone is consistent with the corrosion behavior and the law of the steel bar in the concrete.
【學(xué)位授予單位】:北京科技大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:TG178
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