Papers by Keyword: Corrosion Control

Abstract: Sometimes, in surgical procedure following an accident or illness it is necessary to use metal prostheses or implants to ensure the functionality of bones and joint systems. From time to time, at the end of the patient's healing process, it is necessary to remove the medical device used. In these cases, it would be useful to use resorbable devices to avoid further surgery. A possible solution to the problem could be to use metal alloy devices that degrade over time, while ensuring the functionality of the system. Unfortunately, the chemical compounds generated by the corrosion processes of metal alloys used in the medical field are almost always harmful to human health. The products generated by the degradation processes of some magnesium alloys, on the other hand, are not considered toxic or harmful to human health, so that a device showing controllable degradation rate can be used, guaranteeing the functionality of the implanted device. To achieve this goal, a possible solution could include the use of one or more coatings, capable of controlling the metal degradation process. To do this, we used a first coating obtained by subjecting the samples to a direct current (DC) plasma electrolytic oxidation (PEO) treatment, carried out in an alkaline solution based on silicates and sodium. Subsequently, the samples were coated with a polydopamine (PDOPA) film by dip-coating, and, at the end, a l-polylactic acid (PLLA) coating was applied on the sample by hot-pressing. The coupons were subjected to morphological characterization by Scanning Electron Spectroscopy (SEM) and to electrochemical characterization in Hank's solution at 37°C by means of electrochemical impedance spectroscopy (EIS). The experimental results obtained demonstrate that the coupling of the PEO oxide with the polydopamine and the polymeric film show properties such as to allow the creation of devices which permit the control of the metal degradation process.

Abstract: Corrosion control of metals is of technical, economical, environmental, and aesthetical importance. The use of inhibitors is one of the best options of protecting metals and alloys against corrosion globally. The environmental toxicity of organic corrosion inhibitors has prompted the search for green corrosion inhibitors which do not contain heavy metals or other toxic compounds. In addition to being environmentally friendly, plant products are inexpensive, readily available and renewable. With the growth of the green movement, it is important to prepare environmentally friendly anticorrosive paints to save lot of money, which are lost each year because of corrosion. This study utilized optical measurements, electrochemical impedance spectroscopy (EIS) analysis, scanning electron microscope (SEM) analysis, immersion test in artificial sea water and morphology observations of Arghel extract (AE) as Eco-friendly corrosion inhibitor incorporated in (styrene-acrylic) emulsion paint. In addition Physical, Chemical and Mechanical Properties of dry paint films of the paint test has been done in absence and presence of the corrosion inhibitor. We found that (styrene-acrylic) emulsion paint with 75ppm AE (SP2) has the best performance in protecting mild steel from corrosion.

Abstract: The material defects in automobile industry caused by correction can be found in different components, such as welded and fastened areas in cars and vehicles. The corrosion appears when components with different conducting properties assembled together in electrolyte substances. Different conducted materials show different potentials which will lead corrosion. The corrosion in components can cause many product problems, such as bad quality, less safety, lower energy efficiency, and higher cost. This paper analyzes the rusty mechanism and anti-corrode in regular coating and nanocoating materials via computer-aided simulation and prototype testing. Both computational simulation and sample testing displayed almost equal results that validate the credibility of analytic method proposed in this paper. Keywords: Nanocoating technology, computational simulation, corrosion control, anti-corrosion, computer-aided modeling

Abstract: Al-Zn-Sn anode is not popular for corrosion prevention in marine environment as much as Al-Zn-In anode and Al-Zn-Hg anode because it requires proper heat treatment to obtain the optimum anode capacity. This paper investigates what factors would influence the anode performance of Al-Zn-Sn anode. The fine and homogeneous microstructure is the factor that plays important role to improve the anode capacity. The manufacturing techniques producing fine and homogeneous microstructure in aluminium alloys might be helpful to increase the performance of the anode without the heat treatment process.

Abstract: In this paper, the mechanism, characteristics and categories about corrosion of offshore engineering equipments are investigated. Some of selected advanced surface engineering techniques for corrosion control are introduced. On account of particularity of oceanic environment and performance requirements for the equipments, the paper proposes corresponding anticorrosion measures for offshore engineering equipments. And as a tentative study on surface engineering management & analysis, the paper presents a scenario of anticorrosion design from the viewpoint of System Engineering, including preparation, storage and conveyance of anticorrosion materials, as well as R&D, operation, and management of anticorrosion facilities. It is expected that advanced surface engineering techniques used in anticorrosion can help offshore engineering equipments with good viabilities, perfect performances, low rate of failure, long life-time and high rate of readiness. Anticorrosion design of offshore engineering equipments is of far reaching importance not only to develop our Advanced Manufacturing Technology facing towards 21st century but also to implement sustainable development of our national economy, as well as to our national economy strength.