Influence of SO2 Concentration on Initial Corrosion of Aluminum in Marine Atmosphere

2006 ◽  
Vol 15-17 ◽  
pp. 53-58 ◽  
Author(s):  
De Sheng Han ◽  
Di Li ◽  
Tian Liang Zheng
Keyword(s):  
Weight Gain ◽  
Corrosion Potential ◽  
Potential Change ◽  
Marine Atmosphere ◽  
Corrosion Morphology ◽  
Single Arc ◽  
Depth Increase ◽  
So2 Concentration

Influence of SO2 concentration on initial corrosion of aluminum was studied in simulated marine atmosphere. Variation of initial corrosion morphology, relation between weight gain and time in the course of initial corrosion, corrosion speed (token with maximum pitting depth and weight gain) were analyzed and discussed. Primary results is list below: In marine atmosphere, SO2 sedimentation above 0.1 mg/100cm2 can accelerate Al pitting with low Cl- sedimentation. Both corrosion weight gain and pitting depth increase obviously. For pitting surface of LY12 with SO2 and Cl- sedimentation, corrosion potential change little, Nyquist Graph was single arc of capacitance resist with retractile real part, Rr can’t reflect corrosion degree.

INFLUENCE OF Cl- DEPOSITION CONTENT ON CORROSION OF LY12

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3722-3726
Author(s):  
DESHENG HAN ◽  
DI LI ◽  
TIANLIANG ZHENG
Keyword(s):  
Aluminum Alloy ◽  
Weight Gain ◽  
Electric Potential ◽  
Marine Atmosphere ◽  
Corrosion Morphology ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Tests ◽  
Electrochemical Parameters ◽  
Corrosion Behaviors ◽  
Atmosphere Environment

A series of accelerated corrosion tests were conducted in the simulated marine atmosphere environment to study the corrosion of LY12 aluminum alloy under different Cl - deposition content. The change of corrosion morphology, weight gain and electrochemical parameters (Corrosion Electric Potential, AC Impedance) were inspected in the corrosion course. The different corrosion behaviors caused by the variation of Cl - deposition content were also discussed.

Effects of Ga on the Corrosion Morphology of Al-Zn-Sn-Ga Anode Alloy

2011 ◽  
Vol 117-119 ◽  
pp. 1048-1051
Author(s):  
Jiu Ba Wen ◽  
Jun Feng Li ◽  
Jun Guang He ◽  
Jing Ling Ma
Keyword(s):  
Fermi Energy ◽  
Corrosion Potential ◽  
The Self ◽  
Uniform Corrosion ◽  
Corrosion Morphology ◽  
Corrosion Kinetics ◽  
Corrosion Behaviors ◽  
Corrosion Pits ◽  
Kinetics Of ◽  
Materials Studio

The corrosion behaviors of Al-Zn-Sn and Al-Zn-Sn-Ga alloys were investigated according to the results of immersion tests and corrosion morphology observation，and the Fermi energy of the precipitates was calculated by Materials Studio software for discussing the corrosion kinetics of precipitates . The results show that the Al-Zn phase with high Fermi energy (low corrosion potential) dissolved firstly, than caused the forming of Al-Ga amalgam which deposited between passive film and Al matrix. Meanwhile, the Al-Ga phase with higher Fermi energy dissolved too, which made the Al-Zn-Sn-Ga alloy continue to active, Finally, the Al-Zn-Sn-Ga alloy formed uniform corrosion morphology due to the effect of Al-Ga amalgam, while Al-Zn-Sn alloy formed the surface feature with the deep corrosion pits due to the "self-catalysis" mechanism.

Effect of Corrosion Inhibitor TG201 on Electrochemical Corrosion Behavior of Tubular Steel HP13Cr

2012 ◽  
Vol 229-231 ◽  
pp. 155-158
Author(s):  
Cheng Xian Yin ◽  
Juantao Zhang ◽  
Zhen Quan Bai ◽  
Bin Wei
Keyword(s):  
Corrosion Inhibitor ◽  
Corrosion Behavior ◽  
Corrosion Potential ◽  
Electrochemical Corrosion ◽  
Impedance Spectrum ◽  
Compression Stress ◽  
Corrosion Morphology ◽  
Environment Effects ◽  
Electrochemical Corrosion Behavior ◽  
Resistance Performance

This paper studies effect of corrosion inhibitor TG201 on electrochemical corrosion behavior of tubular steel HP13Cr by polarization curve test and exchange impedance spectrum method. It analyzes corrosion morphology by SEM. The results show that the increase of compression stress on HP13Cr lead to its self-corrosion potential shifting negatively, then electrochemical corrosion rate increases. Finally, corrosion resistance performance of HP13Cr steel weakens in acidification environment. Effects of compression stress on electrochemical corrosion become weak by adding TG201 inhibitors. And inhibitor efficiency of TG201 has obvious increase. So controlling compression stress has certain influence on inhibitors efficiency.

Initial Pitting Behaviour of LY12 Aluminium Alloy in Simulated Marine Atmosphere

2006 ◽  
Vol 519-521 ◽  
pp. 747-752
Author(s):  
De Sheng Han ◽  
Min Guo ◽  
Di Li
Keyword(s):  
Aluminum Alloy ◽  
Weight Gain ◽  
Aluminium Alloy ◽  
Open Circuit Potential ◽  
Open Circuit ◽  
Marine Atmosphere ◽  
Temperature Correlation

By analyzing morphology, weight gain, pitting depth, potential and AC impendence in corrosion course, initial pitting behavior of LY12 aluminum alloy in simulated marine atmosphere was studied. Results indicated initial pitting of LY12 was affected much by Cl- sedimentation and atmosphere humidity, little by temperature below 35°C. Weight gain and pitting depth increased with rising of Clsedimentation quantity, humidity and temperature. Correlation of weight gain and time fitted Model Boltzman. In initial pitting course of LY12, open circuit potential changed little and Nyquist graph had the characteristic of adsorbent resist system.

Pitting Corrosion Behavior of Sintered SUS444 Stainless Steel in MgCl2 Solution

2007 ◽  
Vol 539-543 ◽  
pp. 3255-3260 ◽  
Author(s):  
Satoshi Sunada ◽  
Yusuke Miyazaki ◽  
Kazuhiko Majima
Keyword(s):  
Aqueous Solution ◽  
Stainless Steel ◽  
Corrosion Behavior ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Corrosion Potential ◽  
Corrosion Morphology ◽  
Sem Observation ◽  
Porosity Ratio

The pitting corrosion behavior of sintered SUS 444 stainless steels (P/M specimens) with different kinds of porosity ratios of 13.3, 9.11 and 6.88 % was studied in an aqueous solution containing MgCl2 compared with a conventionally processed SUS 444 stainless steel(I/M specimen). The pitting corrosion potential decreased almost linearly as porosity ratio increased, and the I/M specimen showed the best resistance against the initiation of pitting corrosion. The pitting corrosion morphology by SEM observation showed that more small pits were observed on the specimen with larger porosity ratio while less number but larger diameter pits were observed on the specimen with smaller porosity ratio, and it was also confirmed that the I/M specimen had the least number but the largest and deepest pits.

Effect of Quenching on the Corrosion Morphology of Al-Zn-Sn-Ga Anode Alloy

2011 ◽  
Vol 284-286 ◽  
pp. 1661-1664
Author(s):  
Jiu Ba Wen ◽  
Jun Fen Li ◽  
Jun Guang He ◽  
Jing Ling Ma
Keyword(s):  
Driving Force ◽  
Corrosion Potential ◽  
Cast Alloy ◽  
Corrosion Morphology ◽  
Corrosion Pits ◽  
Uniform Composition ◽  
Corrosion Time

In this paper, the Al-Zn-Sn-Ga anode alloy was quenched from 460 °C. The influences of corrosion time and different microstructure of the alloy on its corrosion morphology were investigated to clarify the effect of quenching on the corrosion morphology of the alloy. The inhomogeneous composition in the as-cast alloy directly caused various corrosion potential in the alloy and that the driving force of corrosion was different. Lots of circular corrosion pits and basic uniform composition were observed in the quenching sample. The results reveal that the corrosion morphology of the anode alloy is affected by quenching treatment employed.

Effects of Ti-1023 Anodized Coating on Corrosion Behavior of Ti-1023/30CrMnSiA and Ti-1023/LY12 Galvanic Couples

2007 ◽  
Vol 546-549 ◽  
pp. 1821-1826
Author(s):  
Jian Hua Liu ◽  
Jun Xiu Shi ◽  
Song Mei Li ◽  
Jun Lan Yi
Keyword(s):  
Corrosion Potential ◽  
Galvanic Corrosion ◽  
Corrosion Current ◽  
Optical Microscope ◽  
Open Circuit ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
Average Value ◽  
Galvanic Couples ◽  
Corrosion Mechanisms

Galvanic properties were evaluated on bare and anodized Ti-1023 titanium alloy which coupled to Ni-electroplated, Zn-electroplated, Cd-electroplated 30CrMnSiA and anodized LY12, respectively. Corrosion properties including open circuit potential (Eoc) of each material, galvanic corrosion potential (Eg), and corrosion current (Ig) of the couples were monitored in conjunction with a Model 263A potentiostat system. Corrosion current density (Īg) and average value of corrosion potential (Ēg) were calculated from Ig-time and Eg-time curves, respectively. Corrosion morphology was observed on a optical microscope (OM) and corrosion mechanisms were analyzed and discussed. The corrosion resistance of Ti-1023/LY12 couple was significantly improved by Ti-1023 anodized coating. However, the coating accelerated the dissolve of the three electroplated coatings in the other galvanic couples, resulting in a heavy corrosion attack on 30CrMnSiA steel.

A Comparison Of The Corrosion Behaviour Of Nanocrystalline And Normal Crystalline Nickel

1991 ◽  
Vol 238 ◽  
Author(s):  
R. Rofagha ◽  
R. Langer ◽  
A. M. El-Sherik ◽  
U. Erb ◽  
G. Palumbo ◽  
...  
Keyword(s):  
Grain Size ◽  
Grain Boundary ◽  
Corrosion Potential ◽  
Corrosion Behaviour ◽  
Corrosion Morphology ◽  
Free Corrosion Potential ◽  
Grain Sizes ◽  
Electrochemical Parameters ◽  
Passivation Current Density

ABSTRACTThe effect of grain size on the corrosion behaviour of nickel in 2N sulphuric acid is evaluated by potentiodynamic testing and characterization of the corrosion morphology for grain sizes ranging from 100μ to 32nm. The influence of the grain boundary component on key electrochemical parameters (free corrosion potential, passivation current density and potential, transpassive dissolution rate) is discussed.

Genes Play Role In Weight-Gain Risk, Behaviors

2008 ◽  
Vol 42 (5) ◽  
pp. 30
Author(s):  
Kerri Wachter
Keyword(s):  
Weight Gain ◽  
Risk Behaviors
Sign in / Sign up

Export Citation Format

Share Document