On protection of AD31 aluminum alloy against atmospheric corrosion with the use of KAP-25 anticorrosion additive

2019 ◽  
pp. 17-22
Author(s):  
A.M. Semiletov ◽  
◽  
Yu.I. Kuznetsov ◽  
A.A. Kolesnikova ◽  
◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Atmospheric Corrosion ◽  
Anticorrosion Additive

New atmospheric corrosion inhibitor of aluminum alloy D16

2020 ◽  
pp. 38-46
Author(s):  
A.M. Semiletov ◽  
◽  
Yu.B. Makarychev ◽  
A.A. Chirkunov ◽  
L.P. Kazansky ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Inhibitor ◽  
Atmospheric Corrosion ◽  
Protective Layer ◽  
Humid Atmosphere ◽  
Water Condensation ◽  
Equimolar Composition ◽  
Aluminum Hydroxides ◽  
Daily Water ◽  
20 Nm

The application of mixed corrosion inhibitor (CI), which is an equimolar composition of oleoyl sarcosinate (SOS) and sodium flufenamate (SFF), for protection of D16 aluminum alloy from atmospheric corrosion has been studied. The polarization measurements used to assess the effectiveness of preliminary passivation of the alloy with solutions of SOS, SFF and their composition showed significant advantages of mixed CI. The XPS method was used to study features of CI adsorption on the surface of D16 alloy. It has been established that upon adsorption of SOS and SFF separately a monolayer is formed, firmly bonded to the alloy surface, thickness of which is not exceeding 2.6—3.2 nm. After the joint adsorption of these CI, the layer thickness reaches 12—20 nm. The composition of this layer includes a considerable amount of Al3+ ions (~20%) related to their compounds with SFF and SOS, as well as to aluminum hydroxides. A possible mechanism for the formation of such a protective layer is proposed. The results of corrosion tests in a humid atmosphere with daily water condensation on samples of D16 alloy confirmed the high protective ability of the mixed CI film.

scholarly journals Effects of Actual Marine Atmospheric Pre-Corrosion and Pre-Fatigue on the Fatigue Property of 7085 Aluminum Alloy

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 81
Author(s):  
Laixin Shi ◽  
Lin Xiang ◽  
Jianquan Tao ◽  
Jun Liu ◽  
Qiang Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Pitting Corrosion ◽  
Atmospheric Corrosion ◽  
Fatigue Property ◽  
Outdoor Exposure ◽  
Fatigue Tests ◽  
Constant Amplitude ◽  
Fatigue Fractography ◽  
Corrosion Mode

Effects of actual marine atmospheric precorrosion and prefatigue on the fatigue property of 7085-T7452 aluminum alloy were investigated by using the methods of marine atmospheric outdoor exposure tests and constant amplitude axial fatigue tests. Marine atmospheric corrosion morphologies, fatigue life, and fatigue fractography were analyzed. After three months of outdoor exposure, both pitting corrosion and intergranular corrosion (IGC) occurred, while the latter was the dominant marine atmospheric corrosion mode. Marine atmospheric precorrosion could result in a dramatical decrease in the fatigue life of the as-received 7085-T7452 aluminum alloy, while selective prefatigue can improve the total fatigue life of the precorroded specimen. The mechanism of the actual marine atmospheric corrosion and its effects on the fatigue life of the 7085-T7452 aluminum alloy were also discussed.

New Atmospheric Corrosion Inhibitor of D16 Aluminum Alloy

2021 ◽  
Vol 57 (7) ◽  
pp. 1344-1351
Author(s):  
A. M. Semiletov ◽  
Yu. B. Makarychev ◽  
A. A. Chirkunov ◽  
L. P. Kazansky ◽  
Yu. I. Kuznetsov
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Inhibitor ◽  
Atmospheric Corrosion

scholarly journals Long-Term Atmospheric Corrosion Behavior of Epoxy Prime Coated Aluminum Alloy 7075-T6 in Coastal Environment

Materials ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 965 ◽  
Author(s):  
Sheng Zhang ◽  
Yuting He ◽  
Teng Zhang ◽  
Guirong Wang ◽  
Xu Du
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Atmospheric Corrosion ◽  
Coastal Environment ◽  
Aluminum Alloy 7075

Characterizations of UV Aging and Atmospheric Corrosion on Epoxy Coated 7A04 Aluminum Alloy

2011 ◽  
Vol 686 ◽  
pp. 784-791
Author(s):  
Chao Fang Dong ◽  
Kui Xiao ◽  
Hai Sheng ◽  
Y.H. An ◽  
Xiao Gang Li
Keyword(s):  
Aluminum Alloy ◽  
Uv Irradiation ◽  
Atmospheric Corrosion ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Alloy System ◽  
Epoxy Coating ◽  
Test Time ◽  
Uv Aging ◽  
Resistance Decrease

The aim of this work is to investigate characterizations of corrosion on 7A04 aluminum alloy with epoxy coating under simulated marine atmosphere with/without ultraviolet irradiation. The environment containing Cl-and sunlight illumination was simulated by salt spray test and UV irradiation/condensation treatment. The corrosion behavior was studied by electrochemical impedance spectroscopy, and level of coating damage was evaluated through gloss measurement. Scanning electron microscope was chosen to observe surface properties of epoxy coating/7A04 aluminum alloy system. The results show that the electrochemical characters are closely related to the aging degree of epoxy coating, which could influence the penetrating process of oxygen and corrosive medium. The coating resistance decrease, while the coating capacitance and the pore rate increase as prolonging of the test time. Along with gloss loss of epoxy coating, pores appear on the surface and the blisters break, which may act as bulk defects of epoxy coating. The coating degradation and substrate corrosion were accelerated by the cooperation of UV irradiation and salt spray. UV aging significant accelerated the deterioration of coating with larger and deeper pores compared to that of non-UV irradiation coating.

Atmospheric corrosion of splat cooled aluminum alloy foils

JOM ◽  
1968 ◽  
Vol 20 (12) ◽  
pp. 10-11 ◽  
Author(s):  
Christina Jansen ◽  
Bill C. Giessen ◽  
Nicholas J. Grant
Keyword(s):  
Aluminum Alloy ◽  
Atmospheric Corrosion
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