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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Chemistry of Concentrated Salts Formed by Evaporation of Seawater on Duplex Stainless Steel
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Chemistry of Concentrated Salts Formed by Evaporation of Seawater on Duplex Stainless Steel

机译：Chemistry of Concentrated Salts Formed by Evaporation of Seawater on Duplex Stainless Steel

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摘要

An investigation has been made of the solution chemistry associated with the concentrated solutions formed by seawater evaporation on hot duplex stainless steel (DSS) and super duplex stainless steel (SDSS) pipe work. The system has been simulated by boiling the seawater until the water content was reduced by about 40:1 to 60:1 by mass. The key observation was the presence of significant levels of Na~+, as well as Mg~(2+), such that the boiling point remained low, about 107 deg C, and the pH of the cooled solution was only about 5.7 to 6.4. It is speculated that a low pH may be formed under a salt crust by hydrolysis of metal ions rather than by an ionic strength effect associated with magnesium chloride (MgCl_2). Electrochemical polarization measurements in the simulated concentrated solutions at 130 deg C and pH 6.4 indicated an unusually low corrosion potential despite a partial pressure of oxygen designed to give an oxygen concentration in solution of 10 ppm. Impedance of oxygen transfer by precipitation of magnesium hydroxide (MgOH_2) is a likely explanation. Pitting corrosion under freely corroding conditions was considered to be only likely at pH less than 2, but the limitations of conventional polarization measurements in simulating underdeposit behavior caution against simple extrapolation to seawater evaporative conditions on the surface of hot pipe work.

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