Corrosion and Mechanical Properties of the Fe‐W‐Wo₂ and Fe‐Mo‐MoO₂ Nanocomposites

Abstract

Analyzing of composition electrolytic coatings’ application for the metal surface protection is considered. It is established that using different components for coatings’ modification gives possibility to obtain surfaces with expanding exploitation properties, in particular, with improved wearing and anticorrosion resistance. The new approach for protecting details which are made from cast irons by obtaining two kinds of composition coatings from binary alloys iron-molybdenum and iron-tungsten is proposed. It is found that the modification of iron by refractory metals up to 37 wt. % leads to a noticeable change in the microstructure of the coatings’ surface. It is established that the incorporation of refractory metals into the iron matrix is a good way to increase the microhardness of the surface by 2.5–3.5 times and rising of the wear resistance by 40%, as well as decreasing the friction coefficient by 3-4 times in comparison with the cast iron substrate. The research results can be used for surfaces hardening and protection in different industries.

Corrosion behavior of austenitic steels in chloride-containing media during the operation of plate-like heat exchangers

“…Studies of the pitting resistance of AISI 304 and AISI 321 steels showed that it mainly depends on the parameters of model circulating waters (x i , x 2 ),the content in them Cr within the standard. At the same time, the results of the analysis (Table 3, № 5) of the mathematical model ( 1) are harmonized with the data of works [16,[31][32][33][34][35] CPT increases by 7.4°C with an increase in the Cr content in steels from 17.1 to 18.3 mass% (Table 1). The pitting resistance of steels and alloys alloyed with Cr is associated with oxide films formed by Cr with O [36 -40].…”

“…The pitting resistance of steels and alloys alloyed with Cr is associated with oxide films formed by Cr with O [36 -40]. In addition, this element affects the solid-phase diffusion of Cr atoms to the surface of metastable pits and promotes their repassivation [33][34][35]. There is an evidence that Cr [41] increase the solubility of nitrogen in corrosionresistant steels, and, consequently, their pitting resistance.…”

Aşınma ve Korozyona Dirençli Çelik Yüzeyler Oluşturmak Için Kullanılan Yüzey İşlemleri Üzerine Bir Derleme

“…Surface treatments are critical to eliminating or minimizing material losses due to wear and corrosion in steel. In addition, different properties of steel such as oxidation resistance, mechanical and electrical-electronic properties, and thermal properties can be improved by surface treatments [4]. Anti-corrosion and anti-wear surface treatments applied to steel materials are listed in Figure 2.…”