Seven types of electrodes have been selected. DC resistances, AC impedances and voltage difference of the electrode pairs have been studied, according to the requirement of low and extra low frequencies electric fields detection in sea water. The feasibilities of these electrodes used for detecting these signals have been studied and explained on theories. The results show that the all-solid-state Ag/AgCl electrode is the most sensitive electrode with its very low DC resistances, AC impedances and the voltage difference controlled within 20μV, which makes it detecting low frequency electric field accurately.
The solid-state Ag / AgCl electrode was used to explore the ocean electric field. The effects of sintering technologies on the stability of electrode potential were researched. Four kinds of electrodes, which were respectively sintered to two temperatures of 380°C and 420°C by two heating methods of direct heating and phase-type heating methods, were prepared. Their surface morphologies, metallographic structures and the electrode potentials in 3.5% sodium chloride solution were analyzed to compare the stability of different sintering technologies. The results show that the electrodes sintered to 380°C by phase-type heating - insulation method have the best stability of potential, and potential difference of two electrodes is less than 0.02079mv/h.
The hydrogen residued process of the High-strength steel surface during the phosphorization process was studied. By the hydrogen permeation experiment, that penetration speed of the hydrogen residued in the metal surface were measured. The result of shows:the more hydrogen gas generated in the process of phosphorization,the more hydrogen atom inside the metal. That means the hydrogen embrittlement criticality of the High-strength steel were more fearful。Dense phosphorizing film always block hydrogen atoms to penetrate into the metal,So that cuold to reduce the hydrogen embrittlement extend of the steel in phosphorization.
A device transmitted alternating electric field signal under water was designed to test the sensitivity of Ag/AgCl electrode to the ELFE. The uniformity of ELFE signal inside the device was tested by solid powder-pressed Ag/AgCl electrode at several place selected in the vertical direction and the horizontal directio. Then, Ag/AgCl electrode simples fabricated by three kinds of technology were tested in the device to contrast the sensitivity of them. Experimental results show that the potential difference between detecting electrodes were proportional to the electrodes spacing. As change the vertical depth of detection electrode from the surface, the testing result did not change. After contrasting test, the results of solid powder-pressed Ag/AgCl electrode were the best. So it is more suitable to be the ELFE detection sensor. With the development of marine exploration and detection, Extremely Low Electric Field (ELEF) detection has become an important research project [. High performance electric field electrode is essential to ocean exploration. Currently, the research of detecting electrode is in infancy. Although the published papers on electrode self-noise and long-term stability are many [2], the sensitivity of detecting electrode was researched less [3]. As the main solute of seawater are strong electrolyte, the high-frequency electric field can be attenuated by the seawater in the transmitting process [4]. Only the ELEF can be detected under seawater from long distance. According to the electric signal transmitting characteristics underwater, a device transmitted alternating electric field signal under water was designed to test the sensitivity of Ag/AgCl electrode to the ELFE[5]. The uniformity of ELFE signal inside the device was tested by solid powder-pressed Ag/AgCl electrode at several place selected in the vertical direction and the horizontal direction. Then, Ag/AgCl electrode simples fabricated by three kinds of technology were tested in the device to contrast the sensitivity of them.
Several rust-transforming reagents based on phosphating technology were studied. The reagents respectively contained potassium ferrocyanide, aromatic oximes (SO) or amide material (GA). By dripping CuSO4 test, linear polarization and polarization curves test, the anti-corrotion performance of phosphate coating were characterized. The results showed that: GA and SO could improve the anti-corrosion performance of phosphate coating. SO restrained the dissolution of metal relying on strong chelation, and the restrained effect of GA depended on durative oxidation and chelation. Comparing to SO, GA could enhance the density of phosphating coating significantly. In addition, the chelation of potassium ferrocyanide had little effect with the anti-corrosion performance.
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