This document describes the motivations for and the effects of cofiring biomass with pulverized coal (pc) in pc-fired boilers. Such cofiring represents a near-term, low-risk, low-cost option for reducing the net CO2 emissions from the power generation sector. This document focuses on four of the critical fireside issues associated with cofiring: ash deposition, NOx production, corrosion, and ca...

The protective role of iron carbonate fi lms deposited on steel surfaces as by-products of carbon dioxide (CO2) corrosion may be hindered by mechanical fi lm removal due to hydrodynamic forces. Damage to the fi lm is frequently accompanied by severe corrosive attack, which may ultimately result in costly equipment failure. The present work reports on experimental investigations of mechanical fi...

Corrosion of iron and mild steel in gas environments at 550 °C was studied by Gas Phase Analysis (GPA) using 13C16,16O2 18,18O2. This technique is shown to be very powerful identifying gas–metal gas-gas interactions. Mild reacts with O2 oxidize decarburise, CO2 decarburise but not oxidize, CO2/O2 carburise. Using simple kinetic modeling, it demonstrated that the oxidation rate initially control...

The stability of an electrodeposited nanocrystalline Ni-based alloy coating in a H₂S/CO₂ environment was investigated by electrochemical measurements, weight loss method, and surface characterization. The results showed that both the cathodic and anodic processes of the Ni-based alloy coating were simultaneously suppressed, displaying a dramatic decrease of the corrosion current density. The co...

The inhibition of the corrosion of N80 steel in 3.5 wt. % NaCl solution saturated with CO2 by four porphyrins, namely 5,10,15,20-tetrakis(4-hydroxyphenyl)-21H,23H-porphyrin (HPTB), 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphyrin (T4PP), 4,4',4″,4‴-(porphyrin-5,10,15,20-tetrayl)tetrakis(benzoic acid) (THP) and 5,10,15,20-tetraphenyl-21H,23H-porphyrin (TPP) was studied using electrochemical impedan...

y-tial intermetallic alloy have a good potential for use as biomaterial, due to its good corrosion resistance. in this paper, two fundamental electrochemical techniques namely electrochemical impedance spectroscopy and potentiodynamic anodic polarization were used to evaluate the corrosion performance of g-tial in ringer's solution. surface modification treatments were employed with the pu...

Five non-precious Ni-Co based alloys were analyzed with respect to their corrosion behaviour. The correlation between the amount of the elements Cr, Mo, V and the corrosion behaviour, expressed by the PREN (pitting resistance equivalent number) index in the case of the allied steels, was extended for Ni-Cr and Co-Cr dental alloys characterization. Open circuit potential, corrosion current densi...