Corrosion characteristics of a nickel-base alloy C-276 in harsh environments

Modelling and Analysis of the Corrosion Characteristics of Ferritic-Martensitic Steels in Supercritical Water

“…The oxygen concentration has the lowest significance, but is only slightly lower than the ODS treatment. In fact, it has been widely acknowledged that temperature generally has the greatest effect on the corrosion behavior of heat-resistance alloys [4,7,27,28,29,30,31]. Therefore, in order to evaluate an alloy’s performance in industry, it is generally the first step to consider the temperature effect.…”

“…Taking magnetite as an example, which has been studied extensively as a function of oxygen partial pressure, the critical boundary oxygen partial pressure (pc,o2) is ~10 −6 atm at 1200 °C [48], ~10 −8.3 atm at 1000 °C [46], ~10 −20 atm at 600 °C [11], ~10 −25 –10 −22 atm at 500 °C [11,46], and ~10 −30 atm at 400 °C [11]. Previous studies have suggested that the rate-controlling step in the corrosion of ferritic-martensitic steels in SCW is the outward diffusion of iron and that the inner layer generally plays the role of the protective barrier layer [7,8,10,12,30,33,51]. However, the inner layer grows into the metal phase at the metal/inner layer interface [52,53], and the cations diffusing outwards through the inner layer are not involved in the growth of the inner layer into the metal.…”

Supercritical Water Oxidation for Environmentally Friendly Treatment of Organic Wastes

“…[21][22][23][24][25]. A series of investigations on the corrosion resistances of these materials under supercritical and/or subcritical conditions [20,24,[26][27][28][29][30], reflected that no one kind of material can withstand corrosion at all conditions, but some exhibit perfect corrosion resistance under specific conditions, as given in Table 1. Thus, appropriate reaction conditions such as heteroatom types in feedstock, reaction temperature, and pressure should be optimized in order to minimize corrosion rate for a chosen reactor construction material.…”

“…Lots of studies have been carried out on the mechanism of corrosion scales grown on metal materials in SCW [29,45,46]. Two typical mechanisms, such as solid-state growth mechanism and mixed model (formation of the inner layer by solid-state growth process and formation of the outer layer by a metal dissolution-oxide precipitation mechanism) depending on the water density below or above 100-200 kg/m 3 , have been proposed [24,29,45,47,48]. Solid-state growth mechanism has been used successfully in corrosion problems of various materials such as alloys and ceramics in high temperature gaseous environments such as single gas (O 2 , N 2 , and CO 2 ), air, high temperature steam, and a series of mixture gases.…”

Review on Mechanisms and Kinetics for Supercritical Water Oxidation Processes

“…Phenix et al [74] found that when hydrogen peroxide was heated to the supercritical condition, a large amount of oxygen emerged in the product. The total decomposition equation of hydrogen peroxide is shown as follows: (12) Tagaki and Ishigure [75] speculated that the above decomposition reaction was carried out through the following paths: (16) where M in Equation ( 13) represents the colliding molecules in the reaction, which can be homogeneous substances (such as water) or heterogeneous substances (such as reactor wall) in the reaction system.…”