Corrosion Performance of Galvanized Steel in Na₂SO₄and NaCl Solutions at Subfreezing Temperatures

Sacrificial Dissolution of Zinc Electroplated and Cold Galvanized Coated Steel in Saline and Soil Environments: A Comparison

“…If there is a large difference in the OCP, sacrificial coating may dissolve quickly, and the substrate is exposed to the aggressive environment. Moreover, there is a possibility of hydrogen (H 2 ) evolution, and its absorption into the steel substrate may lead to hydrogen embrittlement of the steel structure [ 27 , 28 ]. Figure 2 a shows a maximum potential difference of −316 mV vs. Ag/AgCl between MS and GS samples, which may correspond to fast coating dissolution.…”

“…For GS samples, the i corr value increased to 406.5 μA·cm −2 in a saline solution. However, this sample presented low i corr (2.64 μA·cm −2 ) in soil, possibly due to the formation of hydrated zinc oxide and/or chloride species on its surface, which may control the dissolution tendency of GS, suggesting its possible use to protect the steel structures buried in soil [ 27 ]. The values of i corr for DS and BS in the saline environment were 38.18 and 33.06 μA·cm −2 , which were much higher than in soil, therefore suggesting that cold galvanized coatings would preferentially dissolve in the 3.5% NaCl solution by protecting the steel substrate.…”

Corrosion resistance of hot-dip galvanized steel in simulated soil solution: A factorial design and pit chemistry study

“…extensively [39,40] and have mostly been related to the presence of chloride, sulfate, and carbonate [4]. However, the effect of temperature, especially at subfreezing temperatures, has received less attention [41]. Similarly, studies focused on soil corrosion of galvanized steel have neglected the influence of temperature on underground corrosion [11,42].…”

“…These findings agree with those previously reported for the effect of temperature and citric acid on the corrosion resistance of galvanized steel. Padilla and Alfantazi [41] have shown that increasing temperature from -5 °C to 25 °C significantly increases the corrosion current density of galvanized steel in 3.5 wt% NaCl solution. Soriano and Alfantazi [22] have reported the detrimental effect of citric acid on the corrosion behavior of galvanized steel.…”

“…The effect of temperature on O₂ solubility will be discussed in detail later. Moreover, solution resistance is dependent on temperature and increases dramatically below freezing [41]. It is likely that the observed i corr at low temperature levels was a result of a lowered diffusion coefficient of dissolving Zn (II) and a high solution resistance.…”