Molybdenum–phosphorus compounds based passivator to control corrosion of hot dip galvanized coated rebars exposed in simulated concrete pore solution

Synthesis and evaluation of corrosion resistance of molybdate-based conversion coatings on electroplated zinc

“…The float of tiny bubbles when Zn-coated sheets were immersed in passivation baths confirms the evolution of hydrogen. At the same time, the reduction of hexavalent molybdenum (Mo VI) to tetravalent molybdenum (Mo IV) takes place at the metal-solution interface [7]. Hexavalent molybdenum has been found on the surface as Mo trioxide (Fig.…”

“…Treacy et al [6] investigated the behaviour of molybdate conversion coatings on zinc coated mild steel in corrosive chloride environments, and the corrosion resistance of molybdate conversion coatings were less than that of chromate-based coatings, which was due to the weak oxidizing nature of molybdate and the apparent solubility of the reduced molybdenum species. Singh et al [7] developed molybdenum-phosphorus compound based conversion coatings on hot dip galvanized zinc coatings, which exhibited high degree of corrosion protection exposed in chloride contaminated simulated concrete pore solution. The very stable corrosion products promoted the formation of a complex passive layer.…”

Simulation of corrosion protection methods in reinforced concrete by artificial neural networks and fuzzy logic

“…Different methods have been suggested to reduce the corrosion rate of steel reinforcements in concrete. The most important methods include pozzolanic additives, i.e., micro silica (MS) [15], fly ash (FA) [16,17] and granulated blast furnace slag [18], to prepare very dense and strong types of concrete, rebar or concrete coating [19][20][21], the alteration of the steel alloy composition [22], and corrosion inhibitor admixtures [23]. Today, the combination of artificial neural networks (ANNs) and fuzzy logic (FL) methods as powerful tools to analyze and simulate phenomena are used to predict concrete features, such as compression strength.…”

Intermetallic phase kinetic formation and thermal crack development in galvanized DCI

“…Presence of different alloy elements in the bath allows to optimize the HDG processes in order to reduce the scraps but it permits also to change the traditional intermetallic phases, for instance improving the corrosion resistance and the mechanical properties [7]. For instance, stable reaction products that allow improving corrosion resistance have been observed on electrochemically passivated HDG surface [4][5][6]. Other authors analysed the influence of alloy elements in terms of microstructural phases compositions [8].…”