G1100-1-2 Local Anodic Oxidation Process with Water in Lubricant Layer

2-(Thiocyanomethylthio)-benzothiazole (TCMTB) is used as fungicide in the paper, tannery, paint, and coatings industries, and its study is important as it is considered toxic to aquatic life. In this study, a comparison of direct anodic oxidation (AO) using a boron-doped diamond electrode (BDD) and electro-Fenton (EF) processes for TCMTB degradation in acidic chloride and sulfate media using a FM01-LC reactor was performed. The results of the electrolysis processes studied in the FM01-LC reactor showed a higher degradation of TCMTB with the anodic oxidation process than with the electro-Fenton process, reaching 81% degradation for the former process versus 47% degradation for the latter process. This difference was attributed to the decrease in H2O2 during the EF process, due to parallel oxidation of chlorides. The degradation rate and current efficiency increased as a function of volumetric flow rate, indicating that convection promotes anodic oxidation and electro-Fenton processes. The results showed that both AO and EF processes could be useful strategies for TCMTB toxicity reduction in wastewaters.

Download Full-text

Downscaled anodic oxidation process for aluminium in oxalic acid

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/181/1/012044 ◽

2017 ◽

Vol 181 ◽

pp. 012044 ◽

Cited By ~ 2

Author(s):

M Sieber ◽

R Morgenstern ◽

D Kuhn ◽

M Hackert-Oschätzchen ◽

A Schubert ◽

...

Keyword(s):

Oxalic Acid ◽

Anodic Oxidation ◽

Oxidation Process ◽

Anodic Oxidation Process

Download Full-text

Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

Coatings ◽

10.3390/coatings9010057 ◽

2019 ◽

Vol 9 (1) ◽

pp. 57 ◽

Cited By ~ 4

Author(s):

Miroslav Gombár ◽

Alena Vagaská ◽

Marta Harničárová ◽

Jan Valíček ◽

Milena Kušnerová ◽

...

Keyword(s):

Surface Layer ◽

Layer Thickness ◽

Anodic Oxidation ◽

Current Practice ◽

Oxidation Process ◽

Influence Factors ◽

Basic Criterion ◽

Electrolysis Method ◽

Current Densities ◽

Anodic Oxidation Process

The current practice in the field of anodic oxidation of aluminium and its alloys is based mainly on a set of partial empirical experiences of technologists obtained during surface treatment. The aim of the presented paper is deeper and more complex identification of the influence of chemical and technological factors acting during the anodic oxidation process especially on the thickness of the formed surface layer by the electrolysis method in a sulfuric acid solution. The current density was selected as the basic criterion for verification evaluation and analysis of experimentally obtained data, in accordance with Faraday’s laws. For current densities of 1 to 5 A·dm−2, the synergy of significant influence factors was identified, and mathematical and statistical models were then developed to predict the thickness of the surface layer with a relative accuracy of up to 10%. The presented paper does not only focus on the observation of the thickness of the surface layer desired by the customer, but also on the monitoring of this thickness in relation to the overall layer thickness of the coating.

Download Full-text