scholarly journals Structure of Zinc Coating on Steels Formed by Diffusion Saturation in Nitrogen-Containing Atmosphere

2021 ◽  
Vol 346 ◽  
pp. 02022
Author(s):  
Larisa Petrova ◽  
Peter Demin ◽  
Galina Timofeeva ◽  
Khushnuda Sharifhodgaeva
Keyword(s):  
Zinc Coating ◽  
Low Carbon Steel ◽  
Saturation Temperature ◽  
Transitional Zone ◽  
Low Carbon ◽  
Zone Structure ◽  
Diffusion Layers ◽  
Diffusion Technique ◽  
Different Temperatures ◽  
Zinc Coatings

Diffusion technique of metallization is applied for receiving of zinc coatings on low-carbon steel with transitional zone. Structure of diffusion zinc layers after saturation of 09Mn2Si steel in ammonia at different temperatures is examined. Effects on saturation temperature on thickness of diffusion layers are discovered. Process at 600⁰C forms diffusion layers with high strengthening level and with smooth microhardness profiles. Elements (Fe, Zn, N) spectrums are analyzed, and phase composition of zinc coating and of transitional zone is determined.

scholarly journals The impact of exploitation and environmental factors on the degradation of steel road safety equipment

2018 ◽  
Vol 231 ◽  
pp. 01012
Author(s):  
Joanna Kobus ◽  
Lech Kwiatkowski ◽  
Rafał Lutze
Keyword(s):  
Road Safety ◽  
Zinc Coating ◽  
Low Carbon Steel ◽  
Environmental Parameters ◽  
Galvanized Steel ◽  
Traffic Intensity ◽  
Low Carbon ◽  
Zinc Corrosion ◽  
The Impact

The work is aimed at determining the corrosivity of atmosphere in the vicinity of roads, taking into account the characteristics of local emission sources, including traffic intensity of vehicles along with climatic and exploitation factors. Determination of the corrosivity of atmosphere was carried out according to the procedures described in PN EN ISO standards. Samples for testing were made of low carbon steel DC05, zinc and hot dip galvanized steel. Samples were assembled at 19 sites in the close vicinity of roads and highways near the measurement points of vehicle traffic intensity. The mass loss of exposed samples was the basis for determination the atmosphere corrosivity at each of 19 test sites. Regarding steel, the corrosivity category of C4 was observed at 8/19 sites. Corrosion losses outside roads are 2-4 times lower and ranged within the categories of C2 and C3. Zinc corrosion losses classified to category C4 occurred at 2/19 stations. In the remaining ones they corresponded to category C3. In areas outside of roads, zinc corrosion losses are about 20-100% lower (C2). The first attempts to model the dependence of operating and environmental parameters on zinc and zinc coating corrosion losses indicate significant correlation between zinc and zinc coating corrosion losses as a function.

FACTORS DETERMINING GROWTH OF DIFFUSION LAYERS ON LOW CARBON STEEL AND IRON DURING VACUUM CHROMISING

1996 ◽  
Vol 12 (3) ◽  
pp. 229-234 ◽  
Author(s):  
E. Kasprzycka ◽  
J. Tacikowski ◽  
K. Pietrzak
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Diffusion Layers

Effect of Cooling Condition after Warm Rolling on the Development of Microstructure and Texture in an ELC Steel

2005 ◽  
Vol 105 ◽  
pp. 259-264
Author(s):  
Arunansu Haldar ◽  
R.K. Ray ◽  
A.J. Khan
Keyword(s):  
Low Temperatures ◽  
Low Carbon Steel ◽  
Warm Rolling ◽  
The Other ◽  
Texture Development ◽  
Low Carbon ◽  
Deformation Bands ◽  
Cooling Conditions ◽  
Different Temperatures ◽  
Rolling Temperatures

The microstructure and texture development in an extra low carbon steel during warm rolling (~ 80%) in a single pass at four different temperatures and at two different cooling conditions were studied. The g fibre texture develops at lower warm rolling temperatures (500 °C and 600 °C) and a very weak a fibre develops at higher rolling temperatures (700 °C and 800 °C). Very little or no difference in microstructure and texture development was observed under two cooling conditions at four rolling temperatures. No significant effect of cooling rates could be found at higher temperatures of rolling due to very fast static recrystallisation after rolling which also caused the weakening of texture. On the other hand deformation bands produced at low temperatures rolling helped in forming strong g fibre textures.

scholarly journals Assessment and Optimization for Urban Planning Projects

2018 ◽  
Vol 11 (1) ◽  
Author(s):  
Aya A. Hasan ◽  
Walid Mustafa Khamas ◽  
Hafeth I. Naji
Keyword(s):  
Urban Planning ◽  
Fuzzy Ahp ◽  
Electrochemical Techniques ◽  
Low Carbon Steel ◽  
Fuzzy Topsis ◽  
Master Plan ◽  
Low Carbon ◽  
Indirect Contact ◽  
Different Temperatures ◽  
Topsis Technique

After increasing the wheel of progress obviously in recent years in all areas, especially in urban planning projects. This led to the increasing need for a scientific and developing method to organize data processing by choosing the optimized master plan for cities. So, the importance of the process of selecting the optimized master plan of economic, environmental and social because of the indirect contact with the people, so the need arises to seek for the best methods that assist in the evaluation and selection of urban planning projects and decision-making by selecting the optimized master plan. One of the methods is the Fuzzy AHP and Fuzzy TOPSIS. This research concentrates on Fuzzy TOPSIS technique which helps to make the best decisions through choosing the optimized master plan for cities. This research aims to evaluate the alternatives to master plan of cities and select the best ones. To achieve the objectives of the research, the data collected from the literature reviews that dealt with themes of urban planning and Fuzzy TOPSIS technique as well as the personal interviews with specialists. The results showed through the data analysis of the sample that the third alternative (Muqdadiyah urban and agricultural center) has received the largest relative importance compared to other alternatives. In the end, a set of conclusions and recommendations were drawn such as the absence of an administrative system capable of evaluating and selecting the optimized master plan with less time and cost. It was found through using the technical research that time and cost of the evaluation and selection obviously significantly were reduced among the alternatives.Corrosion inhibition of low carbon steel, stainless steel types 316 and 304 in hydrochloric acid by potassium iodide was investigated at different temperatures using weight loss and polarization electrochemical techniques

Influence of a Zinc Coating on the Mechanical Properties of a Low-Carbon Steel Microalloyed with Niobium

2019 ◽  
Vol 2019 (4) ◽  
pp. 436-441
Author(s):  
V. F. Terent’ev ◽  
D. V. Prosvirnin ◽  
A. Yu. Marchenkov ◽  
O. V. Rybal’chenko ◽  
O. S. Antonova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Zinc Coating ◽  
Low Carbon Steel ◽  
Low Carbon

Fe-Me-B Diffusion Layers for Surface Modification of Carbon Steels

2020 ◽  
Vol 403 ◽  
pp. 47-56
Author(s):  
Undrakh Mishigdorzhiyn ◽  
Zhambal Samaev ◽  
Vladimir Mosorov ◽  
Nikolay Ulakhanov
Keyword(s):  
Low Carbon Steel ◽  
Xrd Analysis ◽  
Boride Layer ◽  
Treatment Temperature ◽  
Carbon Steels ◽  
Metallographic Analysis ◽  
Low Carbon ◽  
Microhardness Distribution ◽  
Diffusion Layers ◽  
Two Component

Multicomponent boron-based diffusion layers are capable to provide a wider variety of surface improvements compared to pure boriding. In this research, we consider a way to increase mechanical properties of carbon steels by using two-component thermal-chemical treatment (TCT) such as boroaluminizing (B+Al), and boronickelizing (B+Ni). Diffusion treatment of steel surface was carried out by pack method in powder mixtures, and pastes, containing the above-mentioned elements and sodium fluoride as an activator. The exposure time was 3 hours, the treatment temperature was 950 °C. Pure boriding was conducted additionally to compare with two-component methods. The metallographic analysis revealed diffusion layers with a tooth-like structure after boriding and B+Ni. Typical composition of boride layer with iron boride FeB as an outer phase and Fe2B as an inner one was obtained after the first method. EDS analysis revealed a small amount of Ni (less than 1%) in boronickelized layer. Although XRD analysis revealed Ni2B, Fe3Ni3B besides iron borides and carboborides after B+Ni. Another structure was obtained after B+Al – namely a layered microstructure with outer softer iron aluminides and iron borides beneath. The thickest layer was obtained after boriding with the thickness of 140-160 μm, where higher value corresponds to low-carbon steel and vice versa. While for boroaluminizing the layer thickness was around 120-140 μm and for boronickelizing - 60-100 μm. Microhardness profiles differ significantly depending on the TCT method. For instance, initial high values followed by a drastic drop of hardness for boriding and boronickelizing. Wave type profiles characterize the microhardness distribution on boroaluminized samples. Wear tests indicated that samples with boride layer were the most wear resistant and the least resistant were the samples after B+Al. Fe-Me-B layers with the tooth-like structure are superior to the ones with the layered structure.

Effect of zinc coating on mechanical properties of low-carbon steel microalloyed with niobium

2018 ◽  
pp. 24-29
Author(s):  
V.F. Terentyev ◽  
◽  
D.V. Prosvirnin ◽  
A.Yu. Marchenkov ◽  
O.V. Rybalchenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Zinc Coating ◽  
Low Carbon Steel ◽  
Low Carbon

Surface Modification of Steel by Anodic Plasma Electrolytic Boronitriding and Polishing

2019 ◽  
Vol 972 ◽  
pp. 229-234 ◽  
Author(s):  
Sergei A. Kusmanov ◽  
Vasiliy Belkin ◽  
Irina Kusmanova
Keyword(s):  
Surface Roughness ◽  
Low Carbon Steel ◽  
Corrosion Current ◽  
Low Carbon ◽  
Corrosion Properties ◽  
X Ray ◽  
Diffusion Layers ◽  
Electrolytic Polishing ◽  
Plasma Electrolytic ◽  
Positive Results

The paper shows the possibility of plasma electrolytic polishing of the steel surface after its chemical-thermal treatment. Positive results of the plasma electrolytic polishing are obtained for low carbon steel after its anodic plasma electrolytic boronitriding. An X-ray diffractometer and a scanning electron microscopy were used to characterize the phase composition of the modified layer and its surface morphology. Surface roughness was studied with the use of a roughness tester. The hardness of the treated and untreated samples was measured using a microhardness tester. Corrosion properties of the samples treated surfaces were evaluated using potentiodynamic polarisation tests in solution of sodium chloride. The reduction of the surface roughness of 1.7 times and the corrosion current density of 1.5 times of boronitrided steel by plasma polishing using mode of current interruption for 2 min without changing the structure of the diffusion layers is shows.

Sign in / Sign up

Export Citation Format

Share Document