Measuring corrosion rate and protector effectiveness of advanced multilayer metallic materials by newly developed methods

Abstract

The paper estimates corrosion resistance of new multilayer metallic materials with internal protector against pitting. Using an electron microscope method, the mechanism of the layers' corrosive destruction has been experimentally substantiated. The authors have suggested chemical and electrochemical methods of accelerated corrosion tests allowing for determining the corrosion destruction rate. The electrochemical method reveals the limiting stage of the process and allows calculating the mass corrosion index and substantiating the choice of protector for the specific corrosive medium. The chemical method allows for quantitative assessment of the internal protector's effectiveness and for defining the multilayer/monometallic material corrosion resistance ratio.

The empirical prediction of weight change and corrosion rate of low-carbon steel

“…The weight change of cross-section specimen as an indicator for monitoring the corrosion rate of metallic material can be calculated based on the difference of initial weight before immersion to actual weight of the low-carbon steel specimen after immersion in the NaCl solution [33]. By measuring the weight change of low-carbon steel per unit of surface per unit of time permits us to determine the corrosion rate of low-carbon steel immersed in a series of solution of different NaCl concentrations according to Eq.…”

“…Current uses of low-carbon steel building systems include the manufacturing plants, offices, recreational centers, retail centers, shopping malls, warehouses and many other low-rise building end-uses faced some difficulties and challenges to predict the reliability of lifetime of the steel materials and therefore need some efforts of finding effective ways and providing a theoretical basis for the uses and rapid development of the low-carbon buildings [12]. The electrochemical method of accelerated corrosion reveals a limiting stage of the metal degradation and can be suggested for use in the prediction of corrosion rate [13]. To understand the weight change and corrosion rate of the low-carbon steel requires an understanding of corrosive material immersed in different environments by modeling the experimental data.…”

Investigation of the Fracture Process of Explosively Welded AA2519–AA1050–Ti6Al4V Layered Material

“…Layered composites, due to highly diverse properties of the component materials used to form the layers, allow achieving materials whose functional qualities are different from those of the base materials. This applies not only to mechanical properties, but also to other properties such as corrosion resistance [2], thermal conductivity [3], or electrical conductivity [4,5]. A literature analysis indicates that there is a significant number of different metals used in explosive welded layered composites, which enables producing different configurations, such as Al/Al [6], Al/Cu [7,8], Al/Mg [9,10], Al/Fe [11,12], Al/steel [13,14], Al/Ni [15], Ti/Mg [16], Ti/Ni [17,18], Ti/Cu [19], and Ti/steel [20,21].…”

“…A literature analysis indicates that there is a significant number of different metals used in explosive welded layered composites, which enables producing different configurations, such as Al/Al [6], Al/Cu [7,8], Al/Mg [9,10], Al/Fe [11,12], Al/steel [13,14], Al/Ni [15], Ti/Mg [16], Ti/Ni [17,18], Ti/Cu [19], and Ti/steel [20,21]. 2…”

Multilayer corrosion-resistant material based on iron–carbon alloys

“…They increased the corrosion resistance by laminating the structure of materials containing components with different electrochemical potentials; thus, the corrosion process was split into separate stages, which considerably decreased the rate of through corrosion. The methods of testing the corrosion resistance of such materials were described in detail in [9], and enable predicting the behaviour of the materials in aggressive media and their operation life. At the same time, the principle of corrosion protection embedded into the architecture of multilayer corrosion-resistant materials is based on the well-known processes and phenomena widely applied in materials science and electrochemistry.…”