scholarly journals Influence of Pitting Corrosion on TIG Welded Joints of AA2024 Aluminum Alloy Joints

2021 ◽  
Vol 2115 (1) ◽  
pp. 012052
Author(s):  
K N Gunasekaran ◽  
D Balamurugan ◽  
M Babin ◽  
K J Barath Raj ◽  
S Arun
Keyword(s):  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Corrosion Test ◽  
Solution Treatment ◽  
Inert Gas ◽  
Nacl Solution ◽  
Tungsten Inert Gas Welding ◽  
High Corrosion Resistance ◽  
Ph Values ◽  
Heat Treated

Abstract In this investigation, AA2024 alloy was welded by tungsten inert gas welding. Access the influence of pitting corrosion on TIG weld; the joints were heat-treated after welding with different techniques. Moreover, the corrosion test was carried out with 3.5% NaCl solution under different pH values such as pH:5, pH:7, and pH: 12. From the experimental results, the joint treated with solution treatment with pH: 7 showed high corrosion resistance than its counterparts.

Effects of Heat Treatment on Microstructure and Properties of AZ91D Magnesium Alloy

2013 ◽  
Vol 575-576 ◽  
pp. 410-413
Author(s):  
Ming Wu ◽  
Fang Long ◽  
Hao Ran Geng ◽  
Fang Yang
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Test ◽  
Artificial Aging ◽  
Volume Fraction ◽  
Solution Treatment ◽  
Second Phase ◽  
Az91d Alloy ◽  
Az91d Magnesium Alloy ◽  
Heat Treated

The microstructure, hardness and corrosion resistance of AZ91D alloy were investigated under different solution treatments and artificial aging conditions.When ascast AZ91D alloy was heat treated at 415°C by solution treatmentfor 12 h and artificially aged at 200°C, the volume fraction of precipitates increased with the aging time up to 10 h.When ascast AZ91D alloy was treated at 430°C by solution treatment for 12 h and artificially aged at 200°C for 10h, the volume fraction of precipitates reached a peak value.The results of the corrosion test showed that a high corrosion resisting of the second phase precipitates was beneficial to improving the strength and hardness. Solution treatment at 445°C temperature for 12 h destroied the consecutiveness of β-Mg17Al12 phases.

scholarly journals Effect of Fluid Flow on the Corrosion Performance of as-Cast and Heat-Treated Nickel Aluminum Bronze Alloy (UNS C95800) in Saline Solution

2021 ◽  
Vol 2 (1) ◽  
pp. 61-77
Author(s):  
Hamid Reza Jafari ◽  
Ali Davoodi ◽  
Saman Hosseinpour
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Flow Rate ◽  
Solution Temperature ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Flow Conditions ◽  
Heat Treated ◽  
Nickel Aluminum Bronze

In this work, the corrosion behavior and surface reactivity of as-cast and heat-treated nickel aluminum bronze casting alloy (UNS C95800) in 3.5 wt% NaCl solution is investigated under stagnant and flow conditions. Increasing flow rate conditions are simulated using a rotating disk electrode from 0 to 9000 revolutions per minute (rpm). Optical micrographs confirm the decrease in the phase fraction of corrosion-sensitive β phase in the microstructure of C95800 after annealing, which, in turn, enhances the corrosion resistance of the alloy. Electrochemical studies including open circuit potentiometry, potentiodynamic polarization, and electrochemical impedance spectroscopy are performed to assess the effect of flow rate and heat treatment on the corrosion of samples at 25 and 40 °C in 3.5 wt% NaCl solution. For both as-cast and heat-treated samples, increasing the flow rate (i.e., electrode rotating rate) linearly reduces the corrosion resistance, indicating that the metal dissolution rate is significantly affected by hydrodynamic flow. Increasing the solution temperature negatively impacts the corrosion behavior of the as-cast and heat-treated samples at all flow conditions.

scholarly journals Thermal Stability, Hardness, and Corrosion Behavior of the Nickel–Ruthenium–Phosphorus Sputtering Coatings

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 786
Author(s):  
Yu-Cheng Hsiao ◽  
Fan-Bean Wu
Keyword(s):  
Pitting Corrosion ◽  
Annealing Temperature ◽  
Surface Hardness ◽  
Input Power ◽  
Annealing Process ◽  
Nacl Solution ◽  
Annealing Temperatures ◽  
Heat Treated ◽  
Composition Variation ◽  
Heat Treated Temperature

Nickel–ruthenium–phosphorus, Ni–Ru–P, alloy coatings were fabricated by magnetron dual-gun co-sputtering from Ni–P alloy and Ru source targets. The composition variation and related microstructure evolution of the coatings were manipulated by the input power modulation. The as-prepared Ni–Ru–P alloy coatings with a Ru content less than 12.2 at.% are amorphous/nanocrystalline, while that with a high Ru content of 52.7 at.% shows a feature of crystallized Ni, Ru, and Ru2P mixed phases in the as-deposited state. The crystallized phases for high Ru content Ni–Ru–P coatings are stable against annealing process up to 600 °C. By contrast, the amorphous/nanocrystalline Ni–Ru–P thin films withstand a heat-treated temperature up to 475 °C and then transform into Ni(Ru) and NixPy crystallized phases at an annealing temperature over 500 °C. The surface hardness of the Ni–Ru–P films ranges from 7.2 to 12.1 GPa and increases with the Ru content and the annealing temperatures. A highest surface hardness is found for the 550 °C annealed Ni–Ru–P with a high Ru content of 52.7 at.%. The Ecorr values of the heat-treated amorphous/nanocrystalline Ni–Ru–P coatings become more negative, while with a high Ru content over 27.3 at.% the Ni–Ru–P films show more negative Ecorr values after annealing process. The pitting corrosion feature is observed for the amorphous/nanocrystalline Ni–Ru–P coatings when tested in a 3.5M NaCl solution. Severer pitting corrosion is found for the 550 °C annealed Ni–Ru–P coatings. The development of Ni(Ru) and NixPy crystallized phases during annealing is responsible for the degeneration of corrosion resistance.

scholarly journals Corrosion Resistance of TIG Welded Joints of Stainless Steels

2017 ◽  
Vol 885 ◽  
pp. 190-195 ◽  
Author(s):  
Amanda Silveira Alcantara ◽  
Enikő Réka Fábián ◽  
Monika Furkó ◽  
Éva Fazakas ◽  
János Dobránszky ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Ferric Chloride ◽  
Stainless Steels ◽  
Welded Joints ◽  
Welding Process ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Type Stainless Steel ◽  
Different Types

The aim of this work was to analyze the performance of joints made by TIG (Tungsten Inert Gas) welding process in austenitic and duplex stainless steels with special regards to their corrosion resistance. Three different types of stainless steel were butt welded with TIG method. Ferric-chloride test and electrochemical treatments revealed how does the TIG process affects the corrosion resistance depending upon the alloy used for welding the joint. This work focuses on the weldability of the 2304, 2404 and 304 type stainless steel heterogeneous welds.

TIG Welding of Sintered AISI 316 L Stainless Steel

2010 ◽  
Vol 660-661 ◽  
pp. 454-459 ◽  
Author(s):  
Maurício David Martins das Neves ◽  
Luzinete Pereira Barbosa ◽  
Luís Carlos Elias da Silva ◽  
Olandir Vercino Correa ◽  
Isolda Costa
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Food Processing ◽  
Solid Particles ◽  
Inert Gas ◽  
High Corrosion Resistance ◽  
Weld Joints ◽  
316 L Stainless Steel ◽  
Aisi 316 ◽  
Aisi 316 L

Stainless steel (SS) powders are used in the preparation of sintered SS products. One of the applications of sintered SS products is as filters in the petrochemical and food processing industries. In these industries, the SS filters are subject to severe conditions associated with the removal of solid particles from the fluid. Hence, SS filters should have adequate mechanical strength and high corrosion resistance. Welding can be used to manufacture SS filters. In this study, sintered AISI 316L specimens were welded using the TIG (Tungsten Inert Gas) process. The weld joints were examined by optical microscopy and by scanning electron microscopy. Electrochemical polarization measurements were carried out to evaluate the influence of welding on the corrosion resistance of sintered filters.

scholarly journals Effect of Sr and Ti Addition on the Corrosion Behaviour of Al-7Si-0.3Mg Alloy

2017 ◽  
Vol 17 (2) ◽  
pp. 125-130 ◽  
Author(s):  
M. Uludağ ◽  
M. Kocabaş ◽  
D. Dışpınar ◽  
R. Çetin ◽  
N. Cansever
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Potentiodynamic Polarization ◽  
Corrosion Test ◽  
Corrosion Behaviour ◽  
Tensile Tests ◽  
Nacl Solution ◽  
Cyclic Potentiodynamic Polarization ◽  
Ti Addition

AbstractIn the present study, the corrosion behaviour of A356 (Al-7Si-0.3Mg) alloy in 3.5% NaCl solution has been evaluated using cyclic/potentiodynamic polarization tests. The alloy was provided in the unmodified form and it was then modified with AlTi5B1 for grain refinement and with AlSr15 for Si modifications. These modifications yield to better mechanical properties. Tensile tests were performed. In addition, bifilm index and SDAS values were calculated and microstructure of the samples was investigated. As a result of the corrosion test, the Ecorr values for all conditions were determined approximately equal, and the samples were pitted rapidly. The degassing of the melt decreased the bifilm index (i.e. higher melt quality) and thereby the corrosion resistance was increased. The lowest corrosion rate was founded at degassing and as-received condition (3.9x10-3mm/year). However, additive elements do not show the effect which degassing process shows.

Effect of tempering treatment on pitting corrosion resistance of modified cast CA6NM stainless steel in 3.5 % NaCl solution

2021 ◽  
Author(s):  
Vinda Puspasari ◽  
Mukhlis Agung Prasetyo ◽  
Arini Nikitasari ◽  
Efendi Mabruri ◽  
Moch. Syaiful Anwar
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Nacl Solution ◽  
Pitting Corrosion Resistance ◽  
Tempering Treatment

Study on Chromium-Free Pretreatment Solution of Color Coated Sheet

2014 ◽  
Vol 490-491 ◽  
pp. 104-108
Author(s):  
Chang Rong Ran ◽  
Tai Xiong Guo ◽  
Quan Xu ◽  
Xue Qiang Dong
Keyword(s):  
Corrosion Resistance ◽  
Optimal Condition ◽  
Pitting Corrosion ◽  
Corrosion Test ◽  
Salt Spray ◽  
Experimental Results ◽  
Neutral Salt ◽  
Pretreatment Technology ◽  
Coated Sheet ◽  
Pretreatment Solution

Based on the inorganic and organic composite pretreatment technology, a new chromium-free pretreatment solution consisting of Ce (NO3)3, N-β (aminoethyl)-γ-aminopropyl trimethoxysilane (KH792) and vinyltrimethoxysilane (KH171) was studied and used to treat galvanized sheet. Corrosion resistance of composite silane films on galvanized sheet surfaces was studied using CuSO4 pitting corrosion test and neutral salt spray test. Experimental results show that the corrosion resistance of composite silane film has improved significantly, compared to single silane film. The optimal condition of chromium-free pretreatment solution is that KH792/KH171 ratio is 4/1(v/v), Ce (NO3)3 content is 0.05%(w/w).

The Rehealing Ability of Oxide Scales on K52 Nanocrystalline Coating after Pitting Corrosion

2012 ◽  
Vol 538-541 ◽  
pp. 354-358
Author(s):  
Zheng Hua Zheng ◽  
Yong Yao Lv ◽  
Hui Ping Bai
Keyword(s):  
Oxide Layer ◽  
Pitting Corrosion ◽  
Chloride Solution ◽  
Mixed Oxides ◽  
Oxide Scales ◽  
Nacl Solution ◽  
High Corrosion Resistance ◽  
Internal Oxide ◽  
Edx Analyses ◽  
Sputter Deposited

The rehealing ability of the oxide scales on sputter-deposited Ni-based K52 nanocrystalline coatings after pitting corrosion had been studied by polarization curves in 3.5% NaCl solution. The results indicated that the oxide scales formed on the nano-coatings exhibited excellent rehealing ability after pitting corrosion, and the rehealing oxide scales still had high corrosion resistance. The rehealing ability was declined with longer immersion time in the chloride solution. EDX analyses revealed that the oxide scales within the pits were composed of mixed-oxides. The mixed-oxides were made up of two layers: the external oxide layer was composed of Cr2O3 and TiO2 and the internal oxide layer was Al2O3.

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