Voltammetric Study of the Volmer Reaction on Platinum in Sulfuric Acid Solution. I. Dependence of the Exchange Current Density upon the Hydrogen Coverage at 30°

1964 ◽  
Vol 68 (8) ◽  
pp. 2249-2253 ◽  
Author(s):  
M. W. Breiter
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Current Density ◽  
Exchange Current ◽  
Exchange Current Density ◽  
Voltammetric Study

scholarly journals Corrosion Behavior of AA 1100 Anodized in Gallic-Sulfuric Acid Solution

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 405
Author(s):  
Marlon L. Mopon ◽  
Jayson S. Garcia ◽  
Dexter M. Manguerra ◽  
Cyril John C. Narisma
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Gallic Acid ◽  
Acid Concentration ◽  
Sulfuric Acid Solution ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Anodized Aluminum ◽  
The Common

Sulfuric acid anodization is one of the common methods used to improve corrosion resistance of aluminum alloys. Organic acids can be added to the sulfuric acid electrolyte in order to improve the properties of the anodized aluminum produced. In this study, the use of gallic acid as an additive to the sulfuric acid anodization of AA1100 was explored. The effect of varying anodization current density and gallic acid concentration on the properties of anodized aluminum samples was observed using electrochemical impedance spectroscopy, linear polarization, and scanning electron microscopy. It was observed that the corrosion resistance of samples anodized in gallic-sulfuric acid solution at 10 mA·cm−2 is lower than samples anodized in sulfuric acid. It was also observed that higher anodization current density can lead to lower corrosion resistances for aluminum samples anodized in gallic-sulfuric acid solution. However, samples anodized at 5 mA·cm−2 and at a gallic acid concentration of 5 g·L−1 showed better corrosion performance than the samples anodized in sulfuric acid only. This suggests that the use of low amounts of gallic acid as an additive for sulfuric acid anodization can lead to better corrosion resistances for anodized aluminum.

scholarly journals Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1838
Author(s):  
José Cabral-Miramontes ◽  
Facundo Almeraya-Calderón ◽  
Francisco Estupinán López ◽  
María Lara Banda ◽  
Javier Olguín-Coca ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sulfuric Acid ◽  
Citric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Material Surface ◽  
Citric Acid Solution ◽  
Hard Anodizing

Hard-anodized is a widely used method in the aeronautical sector to improve aluminum alloys abrasion and corrosion resistance. Aim of this work was to characterize the mechanical properties and resistance hard-anodized aluminum 6061 in citric acid solution as a replacement sulfuric acid solution were investigated. Aluminum alloy 6061 was used as the base material to produce the hard anodizing; this process was carried out in a citric and sulfuric acid solution, applying current densities 3 and 4.5 A/cm2 and subsequently exposed to 3.5 wt. % NaCl solution. Microstructure and mechanical properties of the anodizing material were characterized by scanning electron microscopy (SEM) and Vickers microhardness (HV). Corrosion behavior of the hard-anodized material it was carried out with electrochemical techniques as cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) respectively. Results obtained indicated that all samples anodized in citric acid solution showed negative hysteresis and lower corrosion current density (1 × 10−10 A/cm2), indicating generalized corrosion on the material surface. EIS results show that anodizing in citric acid solution and a current density of 4.5 A/dm2 provides better corrosion protection than a sulfuric acid solution.

scholarly journals Continuos Operation of Chromium (VI) Recovery from Sulfuric Acid Solution by Liquid Surfactant Membrane.

1991 ◽  
Vol 17 (6) ◽  
pp. 1104-1109 ◽  
Author(s):  
Yasushige Mori ◽  
Shingo Hibin ◽  
Hideyuki Uemae ◽  
Masataka Tanigaki ◽  
Wataru Eguchi
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Chromium Vi
Sign in / Sign up

Export Citation Format

Share Document