Influence of the complexing agent sodium citrate on the chemical composition, surface morphology and corrosion resistance of Ni–Fe electrodeposits

Silva, G. P. da; Lima, Richelly Nayhene de; Santos, Florencio; Menezes, F. P. S. de; Morais, Livia; Filho, L. F. da Silva

doi:10.1080/00202967.2019.1643586

Cited by 1 publication

(1 citation statement)

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“…The composition of electrodeposited experimental reagents in aqueous solutions is shown in Table 1. CrCl 3 (Sinopharm Chemical Reagent Co., Ltd., Shanghai, China) is used as a chromium source, and sodium citrate is used as a complexing agent [14]. KBr (Sinopharm Chemical Reagent Co., Ltd., Shanghai, China) is used to inhibit the production of Cr 6+ and increase the brightness of the coating, NH 4 Cl is used to prevent the production of chlorine, KCl (Sinopharm Chemical Reagent Co., Ltd., Shanghai, China) is used to improve the dispersion ability and reduce power consumption [15], and boric acid is used to stabilize the pH value of the electrolyte.…”

Section: Preparation Of Cr/low-carbon Steel Diffusion Couplementioning

confidence: 99%

Study on Diffusion Kinetics and Law of Chromium on the Surface of Low-Carbon Steel

Zhang¹,

Zhang

Zhao³

et al. 2023

Coatings

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Cr/low-carbon steel surface composites were prepared by aqueous solution co-deposition and high-temperature solid-state diffusion technology, and the macro rule of the solid-state diffusion of chromium on the surface of low-carbon steel was analyzed. The molecular dynamics (MD) method was used to simulate and calculate the diffusion process of the Cr/Fe interface, and the macro and micro diffusion mechanisms were analyzed. The results show that the diffusion of the chromium in iron is the combined action of the temperature, crystal structure and lattice distortion, and the diffusion coefficients of chromium in α-Fe and γ-Fe have little difference. The vacancy diffusion mechanism of the first adjacent transition is the main diffusion mode. In practice, chromium atoms diffuse along the grain boundaries of the low-carbon steel matrix and provide pinning at the grain boundaries to prevent grain growth. The simulation law is in good agreement with the experimental law. The variation law of the average diffusion coefficient of chromium atoms with temperature is obtained. The diffusion rate of chromium in the bcc crystal structure is obviously higher than that in the fcc crystal structure. In the same crystal structure, the diffusion coefficient of chromium increases with the increase in temperature. However, in the lattice transition temperature region, the diffusion coefficient of chromium gradually decreases with the increase in temperature until the end of the transformation.

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Section: Preparation Of Cr/low-carbon Steel Diffusion Couplementioning

confidence: 99%