Effects of interrupted aging on the intergranular corrosion behavior of Al–Cu–Mg–Ag heat-resistant alloy

2016 ◽  
Vol 13 (6) ◽  
pp. 476-481 ◽  
Author(s):  
Ruijie Zhang ◽  
Xiaoyan Liu ◽  
Zhaopeng Wang ◽  
Fei Gao
Keyword(s):  
Corrosion Resistance ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Corrosion Behavior ◽  
Intergranular Corrosion ◽  
Al Alloy ◽  
Content Type ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant

Purpose The purpose of this study is to research the effects of interrupted aging on the corrosion behavior of Al–Cu–Mg–Ag heat-resistant alloy by means of intergranular corrosion (IGC) testing, potentiodynamic polarization combined with optical microscopy and transmission electron microscopy. Design/methodology/approach The results show that the IGC began on the grain boundaries and continued along the grain boundary. The corrosion resistance property of Al–Cu–Mg–Ag alloy was enhanced by interrupted aging. The precipitations of the interrupted aged sample both in the grains and on the grain boundaries were fine, and the chain-like phases on the grain boundary were distributed nearly continuously. Findings The corrosion resistance of Al–Cu–Mg series Al alloy with equilibrium phase (Al2Cu) is notably determined by precipitation-free zone (PFZ) as the self-corrosion potentials of (Al2Cu), PFZ and the matrix satisfied the relation EPFZ < Eθ<EMatrix. Originality/value The connections of the PFZ on both sides of the grain boundary decreased the corrosion resistance of Al–Cu–Mg–Ag alloy treated by the single aging.

Corrosion behaviour of Mn‐Si‐Fe‐Cu‐Al alloy explosion suppression materials

2013 ◽  
Vol 60 (5) ◽  
pp. 234-238
Author(s):  
Yan Jing ◽  
Chao Zhang ◽  
Jun Ma ◽  
Yongzhong Jia
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Design Methodology ◽  
Room Temperature ◽  
Corrosion Behaviour ◽  
Corrosion Process ◽  
Al Alloy ◽  
Content Type ◽  
Explosion Suppression ◽  
Strengthening Phases

PurposeThe purpose of this paper is to prepare the Mn‐Si‐Fe‐Cu‐Al alloy explosion suppression materials, and determine the corrosion behavior of aluminum alloy explosion suppression materials in HCl and NaOH solutions. The different mechanism of corrosion was discussed.Design/methodology/approachIn this paper, Mn‐Si‐Fe‐Cu‐Al alloy explosion suppression materials were prepared, and the electrochemical behavior of the EAESM was studied. The corrosion parameters were calculated and the mechanism of the corrosion process was discussed. The corrosion behavior was characterized by immersion tests and SEM at room temperature.FindingsMn‐Si‐Fe‐Cu‐Al alloy explosion suppression materials have been prepared. SEM, the polarization curves showed that materials have corrosion resistance. The best content of Al alloy is Mn 0.880%, Si 0.135%, Fe 0.383% and Cu 0.0835%.Originality/valueThe results of this investigation show that adding alloying elements can form new strengthening phases that influence the corrosion resistance of alloys.

Precipitation condition and effect of volume fraction on corrosion properties of secondary phase on casted super-duplex stainless steel UNS S32750

2019 ◽  
Vol 66 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Byung-Hyun Shin ◽  
Dohyung Kim ◽  
Sanghyup Park ◽  
Myungwon Hwang ◽  
Junghyun Park ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Grain Boundary ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Volume Fraction ◽  
Secondary Phase ◽  
Super Duplex Stainless Steel ◽  
Precipitation Condition ◽  
Content Type

Purpose The secondary phase decreased the corrosion resistance because of the segregation of Cr and Mo. Therefore, this paper aims to study the precipitation condition and the effect of secondary phase with volume fraction on corrosion behavior. Design/methodology/approach Secondary phase precipitated approximately from 375°C to 975°C because of saturated Cr and Mo at grain boundary by growth of austenite. Therefore, heat treatment from 800°C to 1,300°C was applied to start the precipitation of the secondary phase. Findings The secondary phase is precipitated at 1,020°C because of segregation by heterogeneous austenite. The growth of austenite at 1,000°C needs the time to saturate the Cr and Mo at grain boundary. When the volume fraction of austenite is 56 per cent (14 min at 1,000°C), the secondary phase is precipitated with grain boundary of austenite. The secondary phase increased the current density (corrosion rate) and decreased the passivation. That is checked to the critical pitting temperature (CPT) curves. The 1 per cent volume fraction of secondary phase decreased CPT to 60°C from 71°C. Research limitations/implications The precipitation of secondary phase not wants anyone. Casted super-duplex stainless steel (SDSS) of big size precipitates the secondary phase. This study worked the precipitation condition and the suppression conditions of secondary phase. Social implications Manufacturers need precipitation condition to make high-performance SDSS. Originality/value The corrosion resistance of SDSS is hard the optimization because SDSS is dual-phase stainless steel. The precipitation of the secondary phase must be controlled to optimize of the corrosion resistance of SDSS. Anyone not studied the precipitation condition of secondary phase and the effect of secondary phase with volume fraction on corrosion behavior of SDSS.

Grain Boundary Precipitate Modification for Improved Intergranular Corrosion Resistance

2006 ◽  
Vol 519-521 ◽  
pp. 327-332 ◽  
Author(s):  
Kinga A. Unocic ◽  
Paul Kobe ◽  
Michael J. Mills ◽  
Glenn S. Daehn
Keyword(s):  
Corrosion Resistance ◽  
Grain Boundary ◽  
Corrosion Behavior ◽  
Intergranular Corrosion ◽  
Salt Water ◽  
Water Environment ◽  
Heat Treatments ◽  
Boundary Precipitate ◽  
Series Aluminum Alloy ◽  
Standard Composition

Intergranular corrosion is a significant concern for Al-Mg alloys when subjected to a corrosive salt-water environment. To address this issue, the standard composition of a 5XXX series aluminum alloy (AA5083) was modified in an attempt to improve the alloy’s overall corrosion resistance through alloying and thermal processing. The concept being that through alloying and heat treatments, desirable precipitate phases such as τ- and/or τ-copper rich phase(s) that are known to offer corrosion resistance would potentially form that could effectively improve intergranular corrosion behavior. Therefore, the chemical composition of standard AA5083 was modified by adding various amounts of copper and zinc. Sensitization heat treatments were then performed to determine the specific conditions under which these phases would form. LOM, SEM, STEM imaging and conventional TEM were used to analyze microstructural features. Corrosion was attributed to a network of detrimental Mg-rich grain boundary precipitates in the standard alloy. Alloying with Cu and Zn can offer improved intergranular corrosion behavior. The mechanism seems to be either by delaying or eliminating precipitation at the grain boundaries.

Enhancing the Localized Corrosion Resistance of High Strength 7010 Al-Alloy

2010 ◽  
Vol 138 ◽  
pp. 1-6 ◽  
Author(s):  
M. Bobby Kannan ◽  
V.S. Raja
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Intergranular Corrosion ◽  
High Strength ◽  
Localized Corrosion ◽  
Al Alloy

This paper brings out the developments on heat-treatment and alloying to improve the stress corrosion cracking (SCC) behavior of 7010 Al-alloy. The role of microstructures including the grain boundary precipitates and recystallized grains and the relation of intergranular corrosion (IGC) on the SCC behavior of 7010 Al-alloy have been discussed.

Study on the Intergranular Corrosion Behavior of Welding Joint of A7N01-T4 Al-Alloy for High-Speed Train

2011 ◽  
Vol 284-286 ◽  
pp. 1594-1597
Author(s):  
Xiao Min Wang ◽  
Guo Qing Gou ◽  
Jun Jing Zhao ◽  
Yan Liu
Keyword(s):  
Corrosion Rate ◽  
Grain Boundary ◽  
Corrosion Behavior ◽  
Intergranular Corrosion ◽  
High Speed ◽  
Al Alloy ◽  
Element Analysis ◽  
Welding Joint ◽  
Corrosion Cell ◽  
Rate Test

This paper studied the intergranular corrosion behavior of A7N01-T4 Al-alloy and its welding joint through corrosion rate test by chemical analysis and morphology observation by metalloscope, LCSM and element analysis by EDS. The results showed that the corrosion rate of welding joint was higher than that of the base, and HAZ was the worst corrosion part of welding joint. Zn2Mg strengthening phase of HAZ segregated continuously along grain boundary under the affected of heat-input of welding, and the low potential of this zinc-rich phase made it to be anode in corrosion cell and dissolved preferentially, an active corrosion route along grain boundary was formed, which made further corrosion develop into inner alloy.

MIDOHM

Alloy Digest ◽  
1962 ◽  
Vol 11 (5) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Specific Resistance ◽  
Operating Temperature ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant ◽  
Copper Nickel

Abstract Midohm is a copper-nickel, heat resistant alloy having a maximum operating temperature of 400 deg F. It is normally used for resistor and potentiometer applications where low specific resistance is required. This datasheet provides information on composition, physical properties, and tensile properties. Filing Code: Cu-117. Producer or source: Driver-Harris Company.

MO-RE 40MA

Alloy Digest ◽  
1998 ◽  
Vol 47 (12) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Creep Strength ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant ◽  
Temperature Performance

Abstract MO-RE 40MA is a fully austenitic heat-resistant alloy for elevated temperature applications. The alloy is microalloyed for creep strength and oxidation resistance. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance. Filing Code: Ni-548. Producer or source: Duraloy Technologies Inc.

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