Corrosion resistance of sensitized austenitic stainless steel (SS) in chloride environments is currently the subject numerous studies. Most them are focused on neutral solutions at room temperature and experiments carried out ground steels surfaces. This paper deals with corrosion behavior AISI 304 acid 1 M solution (pH = 1.1) temperatures 20 ± 3 °C 50 °C. The specimens after sensitization tested as covered by high-temperature surface oxides ("heat tinted"), also their chemical removal to...

The application possibilities of austenitic stainless steels in high friction, abrasion and sliding wear conditions are limited by their inadequate hardness tribological characteristics. In order to improve these properties, thermochemical treatment surface plasma nitriding is suitable. This article focused on corrosion resistance the conventionally nitrided AISI 304 steel (530 °C, 24 hours) 0.05 M 0.5 sodium chloride solutions at room temperature (20 ± 3 °C), tested potentiodynamic...

Plasma electrolytic polishing (PEP) is an environment-friendly alternative to the conventional electrochemical (EP), giving optimal surface properties and improved corrosion resistance with minimum energy time consumption, which leads both economic environmental benefits. This paper focused on behavior of PEP treated AISI 316L stainless steel widely used as a biomaterial. Corrosion plasma polished surfaces without/with chemical pretreatment (acid cleaning) evaluated compared original...

AISI 316Ti is Cr-Ni-Mo austenitic stainless steel stabilized by Ti, recommended for construction of various industrial and medicine devices. In spite its high Pitting Equivalent Resistance Number (PREN=23.688) it underlies local corrosion namely pitting in aggressive chloride environment. Appearance extent damage a particular solution depends strongly on temperature surface treatment. One part tested specimens untreated the second treated nitric acid passivation. Specimens are immersed 24...

Polymer composites, their composition, and properties are the major causes of application as a construction material. Last century composites with polymer matrix were considered most perspective constructional Previous researches have only focused on mechanical characteristics but it is also important to observe before after UV radiation [1, 2]. The aim this study analyse change in which influenced by radiation. It was decided that optimal method for investigation accelerate ageing box. test...

Plasma immersion ion implantation (PIII) of nitrogen is low-temperature surface technology which enables the improvement tribological properties without a deterioration corrosion behavior austenitic stainless steels. In this paper PIII-treated AISI 316L steel surfaces are evaluated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PP) and exposure tests (all carried out in 0.9 wt. % NaCl solution at 37 ± 0.5 °C) compared with non-treated surface. Results three...

The present research deals with the investigation of influence aqueous solutions chemical substances in combination temperature on change material properties polymer composites based epoxy resins reinforced carbon fibers. aim was to investigate and evaluate impact degradation processes due environments different temperatures time their action changes macrostructure composite resin. thermal environment experimental evaluated by monitoring mechanical properties, glass transition temperature,...

Due to the combination of high corrosion resistance and suitable mechanical properties, AISI 316L stainless steel is extensively used as biomaterial for surgical implants. However, heat exposure in inappropriate temperatures can cause its sensitization accompanied by chromium depletion along grain boundaries. This study deals with an assessment susceptibility sensitized pitting under conditions simulating internal environment human body (Hank's balanced salt solution, 37 ± 0.5 °C). The...

Abstract Rubber compounds are complex, chemically active and viscoelastic materials. In this material type, transient changes in the individual rubber properties occur during manufacturing processes. A large number of consist a elastomers virtually all them made up fillers such as (carbon black, silica, kaolin, calcium carbonate, etc.). very important element which composed is sulphur. Its function to ensure cross-linking process vulcanisation. Lubricants, plasticizers various organic...

AISI 304 is Cr-Ni austenitic stainless steel currently used for numerous applications that require high corrosion resistance. Due to the passive surface film this resistant against a uniform corrosion, but halides present in environment can evoke local pitting. Electropolishing recommended obtain quality and increase pitting This paper focused on assessment of effect elevated temperature (50 °C) resistance electropolished acidified 1 M chloride solution. Evaluation based results...

The article deals with the analysis of structure and fracture surface aluminum alloy samples. Alu-minum AlMg9 was used as an experimental material. material from which samples were made supplied cast without heat treatment, specifically produced by continuous casting method. test examined using a Neophot 32 optical microscope, sample scanning electron microscope (SEM). fatigue life tested three-point bending cyclic loading parameters - frequency f = 100 Hz, temperature T 22 ± 5 ℃ stress...

A composite is a material which made up of two or more distinct materials. Composite materials are generally used for buildings, bridges and structures such as boat hulls, swimming pool panels, race car bodies, shower stalls, bathtubs, storage tanks, imitation granite cultured marble sinks counter tops. As result absorption liquids usually occurs change in volume, referred to swelling. This process can give rise physical chemical properties polymers.NIS - Elements 3.0 was evaluate the...

Due to suitable mechanical properties, satisfactory corrosion resistance and relatively low cost, austenitic stainless steels are important biomaterials for manufacture of implants various medical instruments devices. Their properties biocompatibility significantly affected by protective passive surface film quality, which depends on used chemical treatment. This article deals with AISI 316L steel, is the most widely Cr-Ni-Mo biomaterial. Corrosion behaviour five surfaces (original,...

Abstract Temperature is considered a complicated external factor of the susceptibility stainless steels to pitting. This paper deals with corrosion behaviour AISI 316Ti steel in temperature range 22 - 80°C aggressive chloride environments (3 and 5% FeCl 3 solutions). The resistance tested evaluated on base results exposure immersion tests cyclic potentiodynamic tests. According obtained pitting markedly affected by changes – 80°C. Intensity attack increases rise Cl − concentration. Gentle...

Austenitic stainless steels are widely used for various biomedical applications because of their biocompatibility, high resistance to uniform corrosion and suitable mechanical properties. However, they prone local in aggressive halides environments. This article focuses on the effect fluoride added physiological saline solution (0.05 % NaF resp. 0.5 + 0.9 NaCl solution) containing mouthwash NaF) AISI 316L surgical steel. Evaluation is based results 42-days exposition immersion tests...

The paper deals with some problems of quantitative metallography which includes evaluation microstructure by etalons, measurement structural parameters coherent test grids and automatical image analysis. Some advantages disadvantages these methods are shown in this contribution on the example graphitic cast irons. analysis enables to eliminate etalons but it has also negatives.

This paper focuses on the effect of surface treatment (grinding, electrochemical polishing) corrosion resistance AISI 316L, a Cr-Ni-Mo low-carbon austenitic surgical stainless steel, in physiological solution at temperature 37 °C.The influence defect and sensitization by heat behaviour electrochemically polished is also studied.The evaluation based results cyclic potentiodynamic polarization tests microscopic observation specimen surfaces after performed tests.The analysis curves showed...

Abstract Carbon fiber reinforced composite materials offer greater rigidity and strength than any other composites, but are much more expensive e.g. glass materials. Continuous fibers in polyester give the best properties. The carry mechanical loads, matrix transfers loads to fibers, is ductile tough, protect from handling environmental damage. working temperature processing conditions of depend on material. Polyesters most commonly used matrices because they good properties at relatively...

Abstract This work deals with the study of polymers, and, in particular, polyethylene; its production, types, properties, and usage. The experimental part evaluates changes properties polyethylene film to be reused under various exposure conditions selection most suitable medium for application. made low-density (LD-PE) was influenced by aggressive media different pH, specifically Savo disinfection, as a Saponate dish washing Coca-Cola. On LD-PE films water absorption melting temperature...

The development of composite materials and the related design manufacturing technologies is one most important advances in history materials. Composites are multifunctional having unprecedented mechanical physical properties that can be tailored to meet requirements a particular application. Ageing also it defined as process deterioration engineering resulting from combined effects atmospheric radiation, heat, oxygen, water, micro-organisms other factors. present article deals with...

A "composite" is characterized as the comibation of two or more materials with diametrically different properties, which result into creation a new superior and unique material. This most commondefinition that holds true for all composites, however, recently term describes reinforced plastics. Polymers are used in every walk life now-a-days. They not even hundred years old, but play significant role sector such sports, defense, medicine, automotive, electrical, agricultural etc. In...