During the period from 18 - 20 October 2016, ZAG organized the Autumn Corrosion School, which was intended for all who face metal deterioration in their work and want to upgrade their knowledge in this field. Corrosion is one of the main reasons for shortening the life span of various structures, elements of infrastructure facilities, conveying devices, communication systems and products for everyday use. The corrosion of metals is highly influenced by the environment in which the metal is exposed, and with the proper choice of material and protection, its course can be significantly slowed down. In the Autumn Corrosion School, the lecturers familiarized participants with the following areas of corrosion: - Types (types, shapes) of corrosion; - Basics of corrosion; - Corrosion of individual metallic materials: carbon steel, stainless steel, aluminum and aluminum alloys, zinc, titanium, copper and copper alloys; - Corrosive environments: atmospheres (seawater, plumbing systems, heating systems, concrete); - Tribocorrosion; - Corrosion protection; - Practical examples; - Determining the causes of corrosion (practical work in groups). Lectures were carried out by experts from the Laboratory for metals, corrosion and anti corrosion protection at the Slovenian Building and civil Engineering Institute.
F.35 Other
COBISS.SI-ID: 2272359The environment of an oil well is aggressive, due to the high temperatures, pressures and low pH values of the brine being pumped towards the surface. On top of that acidizing jobs are sometimes done, which entails injecting HCl into the oil well to increase production rates, thus dramatically reducing pH. The medium being pumped through the tubing to the surface is considered to be completely devoid of oxygen, which begs the question whether or not stainless steel can repassivate in such an environment. Several different stainless steels have been chosen for investigation, ranging from martensitic to duplex and austenitic. A series of tests has been done, ranging from potentiodynamic measurements to scratch tests and acidic depassivation experiments. The tests have been performed in deaerated NaCl brines with different chloride concentrations, temperatures, pressures and pH values to determine the applicability of the investigated steels. Effects of temperature, chloride concentration, chromium content and molybdenum content of the investigated stainless steels on repassivation are presented and critically discussed.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 2326119In an ideal situation, the corrosion behaviour of a particular material can be characterized using a variety of different electrochemical approaches, starting with typical corrosion methods like corrosion potential measurements, linear polarization, potentiodynamic tests, electrochemical impedance spectroscopy, etc. Quicker processes can be studied by methods less commonly used in corrosion research, like cyclic voltammetry or chronopotentiometry. For these types of measurements, the usual setup for electrochemical investigation is employed: a three-electrode corrosion cell containing a working electrode, a counter electrode, a reference electrode, and a conducting electrolyte. In other situations, corrosion process cannot be monitored using traditional electrochemical techniques because of certain limitations. For example, in the corrosion of steel in concrete or copper in bentonite clay, the corrosive environment is a porous medium instead of a simple corrosive electrolyte. Localized corrosion processes can also be difficult to study, due to the presence of an occluded region on the metal surface. Passive films are often challenging to study because of their small dimensions (on the order of nm) and variability. In such extreme situations electrochemical noise measurements and coupled multi-electrode arrays can be beneficial. In this lecture, corrosion sensors, including electrical resistance probes and coupled multi electrode arrays (CMEA), as well as approaches, such as electrochemical noise analysis, acoustic emission, elongation measurements and digital image correlation, and their use to address challenges in corrosion monitoring in different environments, will be demonstrated. Our experience in the field of corrosion research in Slovenia at the Slovenian Building and Civil Engineering Institute will be presented.
B.05 Guest lecturer at an institute/university
COBISS.SI-ID: 2350695Nuclear Corrosion Summer School 2015 was jointly organized by the Laboratory for Metals, Corrosion and Anticorrosion protection, Paul Scherrer Institute (Switzerland), French Alternative Energies and Atomic Energy Commission (CEA) and University of Manchester (UK). ZAG also managed the entire local organization of the event. Summer school was attended by 24 attendees from 11 different countries including USA, Australia and S. Korea. The summer school was primarily intended for people from nuclear authorities, industry and research organisations who are in charge of nuclear power plant safety and safe nuclear waste storage & disposal. Twelve internationally renowned lecturers covered all necessary topics, starting with fundamental electrochemistry, to provide a self-consistent understanding of nuclear corrosion issues. The main topics were: Electrochemistry and corrosion, Overview on corrosion in the nuclear cycle, Corrosion in light water reactor plants (incl. monitoring and mitigation aspects), Corrosion in nuclear waste disposals, Corrosion in Gen IV systems, Case studies and ageing management and Advanced technologies to characterize corrosion. Accommodation, meals and social program were included in the NuCoSS-15 fee in order to keep the group closed and to facilitate also the informal exchange of information.
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 2163815Dental archwires are exposed to tribocorrosion processes during their use. The simultaneous processes of chemical and mechanical wear can lead to serious medical issues. Two dental alloys in the form of archwires, namely staineless steel AISI 304 and NiTi alloy will be studied in as-received state. Electrochemical methods (potentiodynamic measurements, electrochemical impedance spectroscopy) will be used to define electrochemical properties of the two different dental alloys in simulated saliva. Also, the influence of different oral cavity environments will be studied and its tendency to localized corrosion will be examined. Tribocorrosion processes will be studied by the use of different electrochemical techniques on reciprocating movement tribometer (potential response, current response at open circuit condition and electrochemical noise). Wear rate and the type of wear mechanism will be estimated. Spectroscopic study that will include wear track analysis by SEM/EDS and X-ray photoelectron spectroscopy will be included in the analysis after the wear. Besides that, the analysis of the dissolved ions during mechanical wear will be followed and evaluated. The aim of the research is to gain the information of the tribocorrosion process and to transfer the result to real environment to predict effect on patients and medical treatment efficiency.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 2241895