scholarly journals Pengaruh Variasi Konsentrasi Ekstrak Daun Alpukat (Persea americana M.) Sebagai Inhibitor Pada Baja Tahan Karat SS-304 Dalam Medium Korosif HCl 1M

2019 ◽  
Vol 7 (2) ◽  
pp. 207-214
Author(s):  
Windy Mustika Sari ◽  
◽  
Syafriadi Syafriadi ◽  
Ediman Ginting Suka ◽  
◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosive Medium ◽  
Persea Americana ◽  
304 Stainless Steel ◽  
Inhibitor Concentration ◽  
X Ray ◽  
Inhibitor Efficiency ◽  
Three Samples ◽  
Weight Method ◽  
Ss 304

Avocado leaves extract (Persea americana M.) is used as an inhibitor to the sample of SS-304 Stainless steel which cures in HCl 1M Corrosive Medium for 168 hours, the inhibitor concentration variation added 0%, 2%, 4%, 6%, 8% and 10% respectively. The rate sample is measured by using lose-weight method. The results show the lowest samples is 0,37 mm/y of 6% and the highest 10,75 mm/y of 0%. Inhibitor efficiency to the sample SS-304 Stainless steel potrays the effectively progress to 96,55% with 6% concentration. X-Ray Diffaraction Results accquired BCC and FCC with Fe-a dan Fe-g phase along with SEM that forms agglomeration, cracked, and hole which result on its corrosion. In addition EDS contains Oxygen (O) and Chlorine (Cl) Element which indicate that stainless still has affected by corrotion. Thus from three samples which characterized and measured show that avocado leaves effectively as an inhibitor to the sample SS-304 stainless steel in HCl 1M corrosive medium

Friction Coefficient and Wear Rate of Different Materials Sliding Against Stainless Steel

2013 ◽  
Vol 1 (1) ◽  
pp. 33-45 ◽  
Author(s):  
Dewan Muhammad Nuruzzaman ◽  
Mohammad Asaduzzaman Chowdhury
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Normal Load ◽  
304 Stainless Steel ◽  
Sliding Velocity ◽  
Stainless Steel 304 ◽  
Different Types ◽  
Pin On Disc ◽  
Ss 304

This paper examines the relation between friction/wear and different types of steel materials under different normal loads and sliding velocities and to explore the possibility of adding controlled normal load and sliding velocity to a mechanical process. In order to do so, a pin on disc apparatus is designed and fabricated. Experiments are carried out when different types of disc materials such as stainless steel 304 (SS 304), stainless steel 316 (SS 316) and mild steel slide against stainless steel 304 (SS 304) pin. Variations of friction coefficient with the duration of rubbing at different normal loads and sliding velocities are investigated. Results show that friction coefficient varies with duration of rubbing, normal load and sliding velocity. In general, friction coefficient increases for a certain duration of rubbing and after that it remains constant for the rest of the experimental time. The obtained results reveal that friction coefficient decreases with the increase in normal load for all the tested materials. It is also found that friction coefficient increases with the increase in sliding velocity for all the materials investigated. Moreover, wear rate increases with the increase in normal load and sliding velocity. At identical operating condition, the magnitudes of friction coefficient and wear rate are different for different materials depending on sliding velocity and normal load.

scholarly journals X-ray Diffraction Investigation of Stainless Steel—Nitrogen Thin Films Deposited Using Reactive Sputter Deposition

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 984
Author(s):  
Faisal I. Alresheedi ◽  
James E. Krzanowski
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Substrate Temperature ◽  
Peak Shift ◽  
304 Stainless Steel ◽  
Tetragonal Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Area Detector ◽  
Calculated Parameter

An X-ray diffraction investigation was carried out on nitrogen-containing 304 stainless steel thin films deposited by reactive rf magnetron sputtering over a range of substrate temperature and bias levels. The resulting films contained between ~28 and 32 at.% nitrogen. X-ray analysis was carried out using both the standard Bragg-Brentano method as well as area-detector diffractometry analysis. The extent of the diffraction anomaly ((002) peak shift) was determined using a calculated parameter, denoted RB, which is based on the (111) and (002) peak positions. The normal value for RB for FCC-based structures is 0.75 but increases as the (002) peak is anomalously displaced closer to the (111) peak. In this study, the RB values for the deposited films were found to increase with substrate bias but decrease with substrate temperature (but still always >0.75). Using area detector diffractometry, we were able to measure d111/d002 values for similarly oriented grains within the films, and using these values calculate c/a ratios based on a tetragonal-structure model. These results allowed prediction of the (002)/(200) peak split for tetragonal structures. Despite predicting a reasonably accessible split (~0.6°–2.9°–2θ), no peak splitting observed, negating the tetragonal-structure hypothesis. Based on the effects of film bias/temperature on RB values, a defect-based hypothesis is more viable as an explanation for the diffraction anomaly.

scholarly journals Quantitative Nanoscale 3D Imaging of Intergranular Corrosion of 304 Stainless Steel Using Hard X-Ray Nanoprobe

2019 ◽  
Vol 166 (11) ◽  
pp. C3320-C3325 ◽  
Author(s):  
Simerjeet K Gill ◽  
Mingyuan Ge ◽  
Hanfei Yan ◽  
Kotaro Sasaki ◽  
Zhixiu Liang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Intergranular Corrosion ◽  
3D Imaging ◽  
304 Stainless Steel ◽  
X Ray

Corrosion Behaviour of AISI 304 Stainless Steel with Solar Salt Heat Transfer Fluid

2014 ◽  
Vol 922 ◽  
pp. 13-17 ◽  
Author(s):  
Omar Ahmed ◽  
Le Zhou ◽  
Nahid Mohajeri ◽  
Yong Ho Sohn
Keyword(s):  
Heat Transfer ◽  
Stainless Steel ◽  
Iron Oxide ◽  
Corrosion Behavior ◽  
304 Stainless Steel ◽  
Salt Mixture ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Solar Salt ◽  
X Ray

In an effort to understand the compatibility between the heat transfer medium and the structural materials used in concentrated solar power plants, the corrosion behavior of AISI 304 stainless steel (18 wt.% Cr, 8 wt.% Ni) in a molten solar salt mixture (53 wt. % KNO3, 40 wt. % NaNO2,7 wt. % NaNO3) has been investigated. The 304 stainless steel coupon samples were fully immersed and isothermally exposed to solar salt at 530°C for 250, 500, and 750 hours in air. X-ray diffraction and scanning electron microscopy with X-ray energy-dispersive spectroscopy were employed to examine the extent of corrosion and identify the corrosion products. Oxides of iron were found to be the primary corrosion products in the presence of the molten alkali nitrates-nitrite salt mixture because of the dissolution of the protective chromium oxide (Cr2O3) scale formed on 304 stainless steel coupons. The corrosion scale was uniform in thickness and chromium-iron oxide was found near the AISI 304. This indicates that the scale formed, particularly on the upper layer with presence of sodium-iron-oxide is protective, and forms an effective barrier against penetration of fused solar salt. By extrapolation, annual corrosion rate is estimated to reach 0.784 mils per year. Corrosion behavior of AISI 304 stainless steel is discussed in terms of thermodynamics and reaction paths.

Operando Assessment of Galvanic Corrosion Between Al-Zn-Mg-Cu Alloy and a Stainless Steel Fastener Using X-ray Tomography

CORROSION ◽  
10.5006/2561 ◽  
2017 ◽  
Vol 74 (1) ◽  
pp. 5-23 ◽  
Author(s):  
Veronica N. Rafla ◽  
Andrew D. King ◽  
Sarah Glanvill ◽  
Alison Davenport ◽  
John R. Scully
Keyword(s):  
Stainless Steel ◽  
Galvanic Corrosion ◽  
Steel Wire ◽  
304 Stainless Steel ◽  
Potential Range ◽  
Secondary Phases ◽  
X Ray ◽  
Faraday’S Law ◽  
Intermetallic Particles ◽  
Pure Cu

Operando x-ray tomography was used to study the galvanic corrosion between aluminum alloy 7050-T7451 and Type 304 stainless steel using a simulated fastener covered with droplets of either 4 M NaCl or 2 M MgCl2. The simulated rivet was an x-ray transparent cylindrical 1 mm pin with a 250 μm diameter rivet hole in the center. The rivet hole was embedded with a 500 μm, in length, stainless steel wire. The rivet hole formed an alkaline crevice between the stainless steel and AA7050-T7451 owing to the proximity of anodic and cathodic sites. The corrosion fissures followed an intragranular path and did not follow bands of intermetallic particles. The x-ray tomography indicated that multiple corrosion fissures propagated over the galvanic couple potential range at all depths examined suggesting the presence of multiple strong proximate cathodes. The volume loss was converted to anodic charge using Faraday’s Law. Cathodic reaction rate studies were conducted on Type 316 stainless steel, copper replated on AA7050, pure Cu, and other matrix secondary phases in simulated crevice environments to assess the ability of each to support fissure corrosion. The substrates for fast cathodic reactions capable of supporting the growth of these fissures were found to be the stainless steel fastener, copper replating on the AA7050-T7451 surface, and dealloyed S-phase. Moreover, removal of the stainless steel fastener stifled fissure growth. The damage morphology assessed with x-ray tomography was compared to laboratory-produced accelerated exposures, as well as field data, and were found to have similar morphologies.

Photocathode Protection Properties of TiO2/V2O5 Coating

2009 ◽  
Vol 79-82 ◽  
pp. 651-654 ◽  
Author(s):  
Min Jie Zhou ◽  
Li Zhong
Keyword(s):  
Stainless Steel ◽  
Steel Substrate ◽  
Sol Gel ◽  
304 Stainless Steel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Illumination ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
Cathode Protection

Nano-sized TiO2/V2O5 bilayer coatings were prepared on type304 stainless steel substrate by sol-gel method and were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD). The performance of photocathode protection of the coating was investigated by the electrochemical method. SEM results indicate that the coating surface is continuous, uniform and dense, XRD spectra show that the coating is of anatase TiO2 and V2O5. The experimental results demonstrate that type 304 stainless steel with the bilayer coating can maintain cathode protection for 6h in the dark after irradiation by UV illumination for 1 h.

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