Effect of Electrolyte on the Surface Smoothness Obtained by Electropolishing of Stainless Steel

2012 ◽  
Vol 713 ◽  
pp. 55-60 ◽  
Author(s):  
M. Hernando ◽  
Pedro Jose Núñez López ◽  
Eustaquio García Plaza ◽  
R. Trujillo
Keyword(s):  
Stainless Steel ◽  
Surface Finish ◽  
Chromic Acid ◽  
Bath Temperature ◽  
Surface Finishing ◽  
Initial Surface ◽  
Surface Finishes ◽  
Finishing Process ◽  
Steel Aisi ◽  
Stainless Steel Aisi

Electropolishing is a surface finishing process of metals and alloys that enhances brilliant surface finishes with low surface roughness values. The most widely used electrolytes for the electropolishing of stainless steel are varying concentrations of phosphoric and sulphuric acid, and occasionally additives such as chromic acid. The objective of this study was to assess the performance of three commonly used industrial electrolytes in terms of the surface finish of electropolished stainless steel AISI 316L. Each electrolyte had varying sulphuric-phosphoric acid combinations with or without chromic acid. The following electropolishing conditions were assessed: current density, bath temperature, electropolishing time, and initial surface texture. The results revealed that adding chromic acid to the electrolyte did not significantly enhance surface finish, and electropolishing ranges were quite similar for all three electrolytes.

Electrolyte Effect on the Surface Roughness Obtained by Electropolishing of AISI 316L Stainless Steel

2014 ◽  
Vol 797 ◽  
pp. 133-138 ◽  
Author(s):  
Pedro José Núñez ◽  
Eustaquio García Plaza ◽  
Miguel Hernando Prada ◽  
Roberto Trujillo Coronel
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Sulphuric Acid ◽  
Surface Finish ◽  
Chromic Acid ◽  
Bath Temperature ◽  
Surface Finishing ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Steel Aisi

Electropolishing is a process for the surface finishing of metals and alloys, achieving brilliant surface finish with very low surface roughness values. The most common electrolytes for the electropolishing of stainless steel are varying concentrations of phosphoric and sulphuric acid, and occasionally additives such as chromic acid. The objective of this study was to assess the performance of three commonly used industrial electrolytes in terms of the surface finish of electropolished stainless steel. Each electrolyte had different concentrations of phosphoric acid, sulphuric acid, and chromic acid. The following electropolishing conditions were assessed: current density, bath temperature, electropolishing time, initial textures, and electrode positions. This study on the performance of three industrial electrolytes for the polishing of stainless steel AISI 316L revealed that adding chromic acid does not significantly enhance surface finish, and electropolishing ranges were quite similar for all three electrolytes.

scholarly journals SURFACE STATE EFFECT OF WELDED STAINLESS STEELS ON CORROSION BEHAVIOR

2016 ◽  
Vol 22 (1) ◽  
pp. 44 ◽  
Author(s):  
Tatiana Liptáková ◽  
Martin Lovíšek ◽  
Ayman Alaskari ◽  
Branislav Hadzima
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Passive Layer ◽  
Argon Atmosphere ◽  
Oxidation Products ◽  
Surface Finishing ◽  
Font Size ◽  
Steel Aisi ◽  
Stainless Steel Aisi

<p style="margin: 2pt 0cm; line-height: 12.5pt;"><span style="font-family: 'Times New Roman','serif'; mso-ansi-language: EN-US;" lang="EN-US"><span style="font-size: small;"><span style="color: #585858;">Welding joints of stainless steels are in practice very sensitive places attacked by local corrosion, such as pitting and crevice corrosion, mostly in chloride containing oxidizing environments. It is caused by different oxidation products created on the surface by welding. Corrosion resistance of stainless steels is affected by quality of passive layer (Cr<sub>2</sub></span></span><span style="color: #585858; font-size: small;">O</span><sub><span style="color: #585858; font-size: small;">3</span></sub><span style="color: #585858; font-size: small;">) which created at normal conditions on air. After welding the steels are heated and on the surface are originated different types of oxides which do not have the same protective properties. Resistance to </span><span style="letter-spacing: -0.2pt;"><span style="color: #585858; font-size: small;">intergranular</span></span><span style="color: #585858; font-size: small;"> and pitting corrosion of the welded stainless steels with different surface finishing was tested. Experimental materials are the austenitic stainless steel AISI 316L (welded by the TIG method in inert argon atmosphere with filler) and the ferritic stainless steel AISI CA6-NM (welded by the WPS method in inert argon atmosphere with filler and after welding heat treated). Character of the surface after welding and after finishing by grinding and pickling was evaluated by SEM microscopy, EDX analysis. Corrosion resistance to local forms of corrosion was investigated by electrochemical potentiodynamic test and by exposure tests in chloride solutions. The steel AISI CA6-NM was tested in fluvial water to simulate real operation environment. The evaluation is supported by microscopic analysis. Susceptibility to intergranular corrosion was tested too and results detect the dangerous localities for corrosion attack and show increasing of corrosion resistance by surface treatment. </span></span></p>

The Study of Surface Finish in Face Milling of Stainless Steel: AISI 304

2013 ◽  
Vol 650 ◽  
pp. 606-611 ◽  
Author(s):  
Songsak Luejanda ◽  
Komson Jirapattarasilp
Keyword(s):  
Stainless Steel ◽  
Surface Finish ◽  
Feed Rate ◽  
Cutting Speed ◽  
Milling Process ◽  
Face Milling ◽  
Depth Of Cut ◽  
Aisi 304 ◽  
Steel Aisi ◽  
Stainless Steel Aisi

This research was to study the effect of face milling on the surface finish of stainless steel: AISI 304. The experiment was applied on three factors and were consisted of three levels of cutting speed, depth of cut and feed rate. The face milling process was chosen to experiment which used face milling cutter with insert carbide tool. The surface roughness average (Ra) was applied to indicating for surface finish. The experiment results were analyzed by ANOVA. The main factors and factors interaction that affected to surface finish were investigated. Effect of cutting speed, feed rate and depth of cut on surface finish of stainless steel: AISI 304 was discussed.

Chatter Suppression with Magnetic Damping in Turning of Stainless Steel AISI 304

2013 ◽  
Vol 393 ◽  
pp. 183-188 ◽  
Author(s):  
Ummu Atiqah Khairiyah B. Mohammad ◽  
A.K.M.N. Amin ◽  
Muhd Amir Hafiz Bin Ahamad Mahrodi ◽  
Muammer D. Arif
Keyword(s):  
Magnetic Field ◽  
Stainless Steel ◽  
Permanent Magnet ◽  
Surface Finish ◽  
Machining Accuracy ◽  
Aisi 304 ◽  
Tool Holder ◽  
Chatter Suppression ◽  
Steel Aisi ◽  
Stainless Steel Aisi

Chatter is almost an unavoidable phenomenon during machining, normally accompanied by a characteristic sharp and monotonous noise. Apart from noise pollution in the industry, chatter leaves a bad surface finish on the part and negatively influences dimensional tolerances, reduced productivity, excessive tool wear and damaged machine-tool components. Therefore, chatter avoidance is utmost importance. However, a deeper investigation into chatter formation reveals that chatter appears during metal cutting process as a result of resonance caused by interaction of the prominent natural frequencies of the system with the frequency of chip serration. This paper presents an innovative approach to chatter suppression during turning of stainless steel AISI 304 applying permanent magnet from the bottom of the tool holder to increase the damping coefficient of the tool holder, since it has been identified that the tool holder is the main vibrating component during turning. A special fixture was designed, fabricated and mounted on the carriage of a conventional turning machine Harrison M390 for holding a permanent magnet bar. The variable cutting parameters were - cutting speed, feed rate and depth of cut at constant tool overhang of 120 mm. The experiments were designed based small Central Composite Design (small CCD) based on the Response Surface Methodology (RSM) approach using DESIGN EXPERT (DOE) software. The experiments were performed under two different conditions, the first under normal conditions, while the other was under the application of magnetic field from permanent magnet located side direction of the tool holder. The experiments focused on monitoring the vibration signals using a vibration data acquisition system during turning operation. Analysis of the recorded signals in the FFT domain indicated significant reduction of chatter when a magnetic field is applied. It is apparent that a reduction of chatter amplitude will result in improved surface finish, tool life, machining accuracy, productivity, as well as reduction of operation.

Uniform Internal Finishing of SUS304 Stainless Steel Bent Tube Using a Magnetic Abrasive Finishing Process

2004 ◽  
Vol 127 (3) ◽  
pp. 605-611 ◽  
Author(s):  
Hitomi Yamaguchi ◽  
Takeo Shinmura ◽  
Megumi Sekine
Keyword(s):  
Magnetic Field ◽  
Stainless Steel ◽  
Removal Rate ◽  
Surface Finishing ◽  
Initial Surface ◽  
Magnetic Abrasive Finishing ◽  
Sus304 Stainless Steel ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
The Magnetic Field

This research studies the factors affecting the conditions required for successful uniform internal finishing of SUS304 stainless steel bent tube by a Magnetic abrasive finishing process. In particular, the effects of the magnetic field and ferrous particles were investigated. Local intensification of the magnetic field is accomplished by offsetting the axis of pole rotation from elbow axis. This effect enables local control of the material removal rate, which leads to uniformity in the finished surface regardless of the initial surface conditions. A two-phase finishing process controlling the size of the ferrous particles is proposed to achieve efficient fine surface finishing.

AL TECH MIAMI

Alloy Digest ◽  
1983 ◽  
Vol 32 (11) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Heat Treating ◽  
Good Resistance ◽  
Aisi Type ◽  
Steel Aisi ◽  
Resistance To Wear ◽  
Specialty Steel ◽  
Stainless Steel Aisi ◽  
Plastic Mold

Abstract AL TECH MIAMI is both a hardenable stainless steel (AISI Type 420) and a tool steel for making molds for plastic. A major requirement for plastic mold steel is corrosion resistance. Certain plastics, such as poly-vinyl chlorides, are very corrosive and stored molds often rust from sweating water lines and/or humid environments. AL TECH MIAMI has good resistance to wear. It is melted and AOD refined to assure the mold-maker of cleanliness and freedom from internal imperfections. It provides exceptionally good polishability for lens-quality molds. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: SS-435. Producer or source: AL Tech Specialty Steel Corporation.

scholarly journals Influence of Activated Fluxes on the Bead Shape of A-TIG Welds on Carbon and Low-Alloy Steels in Comparison with Stainless Steel AISI 304L

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 530
Author(s):  
Jerzy Niagaj
Keyword(s):  
Stainless Steel ◽  
Penetration Depth ◽  
High Strength ◽  
Tig Welding ◽  
Low Alloy Steels ◽  
Aisi 304L ◽  
A Tig Welding ◽  
Alloy Steels ◽  
Steel Aisi ◽  
Stainless Steel Aisi

The article presents results of comparative A-TIG welding tests involving selected unalloyed and fine-grained steels, as well as high-strength steel WELDOX 1300 and austenitic stainless steel AISI 304L. The tests involved the use of single ingredient activated fluxes (Cr2O3, TiO2, SiO2, Fe2O3, NaF, and AlF3). In cases of carbon and low-alloy steels, the tests revealed that the greatest increase in penetration depth was observed in the steels which had been well deoxidized and purified during their production in steelworks. The tests revealed that among the activated fluxes, the TiO2 and SiO2 oxides always led to an increase in penetration depth during A-TIG welding, regardless of the type and grade of steel. The degree of the aforesaid increase was restricted within the range of 30% to more than 200%.

Sign in / Sign up

Export Citation Format

Share Document