Research on the Corrosion Behavior of Q235 Pipeline Steel in an Atmospheric Environment through Experiment

Abstract

Low-carbon steel pipelines are frequently used as transport pipelines for various media. As the pipeline transport industry continues to develop in extreme directions, such as high efficiency, long life, and large pipe diameters, the issue of pipeline reliability is becoming increasingly prominent. This study selected Q235 steel, a typical material for low-carbon steel pipelines, as the research object. In accordance with the pipeline service environment and the accelerated corrosion environment test spectrum, cyclic salt spray accelerated corrosion tests that simulated the effects of the marine atmosphere were designed and implemented. Corrosion properties, such as corrosion weight loss, morphology, and product composition of samples with different cycles, were characterized through appearance inspection, scanning electron microscopy analysis, and energy spectrum analysis. The corrosion behavior and mechanism of Q235 low-carbon steel in the enhanced corrosion environment were studied, and the corrosion weight loss kinetics of Q235 steel was verified to conform to the power function law. During the corrosion process, the passivation film on the surface of the low-carbon steel and the dense and stable α-FeOOH layer formed after the passivation film was peeled off played a role in corrosion resistance. The passivation effect, service life, and service limit of Q235 steel were studied and determined, and an evaluation model for quick evaluation of the corrosion life of Q235 low-carbon steel was established. This work provides technical support to improve the life and reliability of low-carbon steel pipelines. It also offers a theoretical basis for further research on the similitude and relevance of cyclic salt spray accelerated corrosion testing.

Improving the anticorrosion property of outdoor fitness equipment via a novel Ti/Zr/Mo composite conversion coating

“…The presence of OH − ions trigger a positive reaction with Fe 3+ ions, resulting in the formation of poorly soluble Fe(OH) 3 on the surface. Subsequently, Fe(OH) 3 undergoes dehydration and transforms into Fe 2 O 3 , as illustrated in equation (5). Simultaneously, TiF6 2− , ZrF6 ( )…”

“…In recent times, with an escalating preoccupation towards personal well-being, a remarkable surge has been witnessed worldwide in the construction of outdoor fitness equipment (OFE), emblematic of a growing commitment to health-conscious lifestyles [1,2]. Primarily composed of Q235 steel, OFE capitalizes on its impressive amalgamation of robust strength, pliability, tenacity, and malleability [3][4][5], rendering it an ideal choice for materializing these fitness installations. However, because of its poor anticorrosion property [6], OFE is highly susceptible to corrosion, especially in some coastal areas or acid rain-prone areas [7].…”

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

“…Within industrial production, surface coatings have certainly asserted themselves as a key field, especially in oil and gas pipeline construction [1,2], automotive manufacturing [3,4] and equipment anticorrosion [5][6][7], with the overarching goal of enhancing protection performance while meeting the functional requirements in practice. Compared to brushing and rolling, coatings obtained by spraying are widely used, owing to their superior coating quality, higher efficiency and adaptability.…”

The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution

“…Reinforced concrete (RC) structures will suffer serious damage and cause huge economic losses due to the corrosion of steel reinforcement starting from the depassivation of the passive film on the surface of the steel bar [ 1 , 2 , 3 , 4 ]. The characteristics of the passive film are the response contributing to the anti-corrosion of steel bars and further affect the durability of RC structures [ 5 ].…”