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In the present study, thermal effects on the corrosion behavior and corrosion protection performance of TSA coating were investigated using various electrochemical techniques. Heat treatment at higher temperature induces more cracks in the sealer and aluminum coating. Water and corrosive species (e.g., Cl-) penetrate through the cracks, resulting in corrosion of steel substrate.
Several mechanisms including Hydrogen-Enhanced Localised Plasticity (HELP) and Hydrogen-Enhanced De-cohesion (HEDE) have been identified as contributing to the hydrogen embrittlement susceptibility of UNS N07718, depending upon microstructural particularities in the material.
Dissimilar metal welds (DMWs) are commonly used in the pressure vessel nozzle to safe-end weld between the ferritic low-alloy steels (LAS) and the austenitic stainless steels (SS), using a nickel-base filler metal. The complex DMW interface consists of different microstructural regions including, for instance, the heat-affected zone (HAZ), carbon-depleted zone (CDZ), carbon build-up at fusion boundary, partially melted zone (PMZ) and carbide precipitation zone. There is still knowledge lacking on the microstructural characteristics of the interface of DMWs upon post-weld heat treatment (PWHT). DMWs are potential concerns regarding the structural integrity of the nuclear power systems. In particular, the LAS/nickel-base alloy weld metal interface is known to develop a local strength mismatch upon PWHT and during long-term ageing. A significant chemical composition gradient, especially in terms of carbon (C) and chromium (Cr) associated with a complex microstructure have been observed to form at the interfaces. The different welding orientation, heat transfer and PWHT can result in different microstructure and mechanical properties.
In this work, the effect of Tungsten on the precipitation kinetics of a 25% Cr SDSS, namely, UNS S32760 was quantified by constructing Time-Temperature-Transformation (TTT) diagrams.
The present paper reports results of analyses that address the influence of physical and modeling variables upon failure projections.
The primary objective of this study was to investigate iron carbonate (FeCO3) formation mechanisms on ferritic-pearlitic carbon steel corroding in a CO2 saturated aqueous solution near iron carbonate saturation, with particular emphasis on the effect of solution pH.
Surface conditioning is the first step in building efficient corrosion protection on a part or structure. Key concerns during this step include, how to create a stronger anchor-profile and how to efficiently remove previously coated, damaged, or corroded elements from a materials surface prior to coating. The ideal solution must consider three areas of the surface conditioning process: finish quality, cleaning efficiency and total cost.
Coating performance and longevity is highly dependent on the quality of substrate surface preparation. The effect of profile height, profile type (e.g., type of tool used to perform the prep, angularity of profile, etc.), extent of cleanliness, and amount of chloride contamination on coating performance were all studied to determine the correlation between these factors in an attempt to identify the primary factor in coating failure due to improper surface preparation.
In the present study, the effect of temperature on the adsorption/desorption kinetics and thermodynamics of diethylenetriamine talloil fatty acid imidazoline (DETA/TOFA imidazoline) is studied on a gold coated crystal using a quartz crystal microbalance (QCM) in a CO2 saturated 1wt% NaCl aqueous solution.
Measurement of uniform corrosion resistance in the presence of H2S, through polarization curves, and slip steps height and spacing, through Atomic Force Microscopy technique (AFM) have been performed.