Abstract
In this work, the corrosion behavior and mechanical properties of 30CrMnSiA high-strength steel under a harsh marine atmosphere environment were systematically studied using accelerated test technology, along with corrosion kinetic analysis, microstructure and phase composition analysis, electrochemical measurements, and mechanical property tests. The influence of corrosion time on corrosion kinetics was characterized by the weight loss method. The corrosion layer and its product evolution were analyzed by SEM, EDS, XRD, and XPS. The corrosion behavior of steel was studied by a potentiodynamic polarization curve and EIS. Finally, the influence of corrosion on mechanical properties was studied by tensile and fatigue tests. The results show that 30CrMnSiA high strength steel has good corrosion resistance in a harsh marine atmosphere environment. Its corrosion behavior is cyclical: the outer rust layer exfoliated, the inner rust layer became the outer rust layer, and the matrix became inner rust due to the attack by the corrosive medium. The rust layer had a great protective effect on the matrix. The mechanical properties of 30CrMnSiA high-strength steel were reduced under the corrosive environment, and corrosion had a significant effect on its fatigue resistance.
Highlights
Accepted: 13 January 2022The atmospheric corrosion of metals is very common and causes substantial economic losses every year [1]
Guo et al studied the effect of salts and their mixing ratio on the corrosion behavior of 316 stainless steels in a simulated salt lake atmosphere by using a wet-dry alternated test, and the results indicated that mixing different salts causes differences in the corrosion rate and corrosion products [14]
High-strength steel under an indoor accelerated harsh marine atmospheric environment, it was demonstrated that, the corrosion is uniform, corrosion occurs at different stages in the fine area of the exposed surface, which leads to specimen thinning due to the exfoliation of the outer rust layer
Summary
The atmospheric corrosion of metals is very common and causes substantial economic losses every year [1]. Due to the wet–dry cycling characteristics on the metal surfaces, any accelerated test should take this aspect into consideration in order to ensure the consistency of the corrosion mechanism [21]. The corrosion resistance [22] and mechanical properties [10] of metals can be rapidly evaluated through short-term accelerated test results, as well as the protective effect of the rust layer [23], and the influence of environmental factors on both of them [24,25]. The corrosion behavior of 30CrMnSiA high-strength steel under marine atmospheric environments, especially with high temperature, high humidity, and high chloride ion deposition rate. The corrosion behavior and mechanical properties of 30CrMNSiA highstrength steel under an indoor accelerated harsh marine atmosphere environment were systematically discussed through accelerated tests. The influence of corrosion on the mechanical properties of steel was monitored by tensile and fatigue tests
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