Corrosion Behavior of 304 Stainless Steel Exposed to a Simulated Salt Lake Atmosphere

Abstract

The corrosion behavior of stainless steel exposed to a simulated salt lake atmosphere has been investigated by analyzing the evolution of surface morphologies and corrosion products, the initiation and development of pits, and the electrochemical characteristics. The results indicated that (Mg 6 Fe 2 (OH) 16 (CO 3 )(H 2 O) 4.5 ) 0.25 , a layered double hydroxide, has been detected for the first time in the corrosion products formed on stainless steel exposed to a simulated salt lake atmosphere. The specimens exposed to MgCl 2 deposit conditions were corroded more severely than those exposed to NaCl deposit conditions, which was attributed to the differences in the deliquescence relative humidity and efflorescence relative humidity values of MgCl 2 and NaCl. In addition, a special corrosion morphology consisting of a concentric circle of yellowish material was observed on the specimens exposed to MgCl 2 deposit conditions, which was attributed to the formation of Mg(OH) 2 , inhibiting the diffusion and migration of OH − ions to the anode region. The maximum pit depth followed a power function with respect to corrosion time. The corrosion mechanism of stainless steel exposed to a simulated salt lake atmosphere is also discussed.

Analysis of Galvanic Corrosion Current between an Aluminum Alloy and Stainless-Steel Exposed to an Equilibrated Droplet Electrolyte

“…These precipitates build up over time, constricting exchange from the corroding area to the outside and suppressing further oxidation under the deposit. 14…”

“…These electrolytes, formed from atmospheric processes, 7 are characterized by their finite volumes, time-varying compositions in response to changes in temperature, relative humidity, 8,9 deposition rate, 10,11 and varying transport rates for their components. 12,13 The response of many metals and alloys with engineering applications to atmospheric exposure, including steels, 12 stainless steels, 14 copper alloys, [15][16][17] and aluminum alloys, 18 has been extensively studied. Their susceptibility to corrosion can differ under changing atmospheric conditions and can substantially contrast from behavior observed under seawater immersion.…”

Corrosion behaviour of Ti alloy TA8-1, Cu alloy B19 and Cu as candidate materials for nuclear waste containers under early deep geological conditions

“…Figure 1(d) shows the increasing corrosion current density ( I corr ) of Ti alloy TA8-1 with temperature derived from the Tafel plots. The trend is further confirmed by the change of charge transfer resistance from the EIS analysis, which is in inverse proportion to corrosion kinetics, indicated as I corr [23,24].…”

Corrosion Behavior of 316L Stainless Steels Exposed to Salt Lake Atmosphere of Western China for 8 years

“…However, the peak at 714.3 eV has no corresponding substance. Based on the researches on the corrosion of steel exposed to salt lake atmosphere [15,16], the substance at 714.3 eV can be assigned to LDH-Cl (layered double hydroxides) [32], a special corrosion product formed on steel in the environment containing MgCl 2 . Cr is present as Cr (metal), Cr(III) oxide, Cr(III) hydroxide and Cr(VI) oxide at 574.6, 576.4, 577.4 and 578.8 eV, respectively (Fig.…”