The influence of pre-straining on the corrosion fatigue performance of two hot-dip galvanised steels

Progress in Scanning Electrochemical Microscopy by Coupling with Electrochemical Impedance and Quartz Crystal Microbalance

“…[7,[18][19][20] Scanning electrochemical microscopy (SECM) has been developed from the end of the 80s by Engstrom et al [21][22][23] and Bard et al [12,24,25] for the visualization of concentration profiles with a spatial resolution in the micrometer range. Using a microelectrode as a probe, the local reactivity of the substrate can be explored and quantitative analysis of reaction mechanisms can be performed.…”

“…Other non-invasive localized techniques such as SRET, [18] which consisted in rastering a microreference electrode [19] over the substrate for mapping the potential distribution in solution have been used to characterize the heterogeneous surface reactivity. [7,[18][19][20] Scanning electrochemical microscopy (SECM) has been developed from the end of the 80s by Engstrom et al [21][22][23] and Bard et al [12,24,25] for the visualization of concentration profiles with a spatial resolution in the micrometer range.…”

Influence of Corrosion on Fatigue of the Fastening Bolts

“…Bolt connections are protected against corrosion by galvanizing. Literature reports indicate that the presence of a zinc coating does not affect the static strength of hot-dip galvanized elements, but there is a reduction in fatigue strength when compared to non-galvanized elements [ 16 , 17 , 18 , 19 , 20 , 21 ]. Berto et al [ 16 , 17 , 18 , 20 , 21 ] indicate that this effect is noticeable in the air, but the reduction in fatigue life is very limited compared to uncoated structural elements.…”

“…The situation has been complicated by the presence of a corrosive environment. Elimination of the fatigue limit in air and drastically reduced fatigue life are the two main effects of corrosive environments [ 19 ]. Michailidis et al [ 22 ] indicate different mechanisms of fatigue cracking of non-galvanized and galvanized elements.…”

“…The influence of assembly on the final strength of the tested connections was also found [ 21 ]. Berchem [ 19 ] proved that the quantity of cracks in the zinc coating increases as a result of applying a preload at very low stress amplitudes and under corrosive conditions. Consequently, it leads to a reduction in the fatigue strength of galvanized steel.…”