Microstructural study of a high-strength stress-corrosion resistant 7075 aluminium alloy

1982 ◽  
Vol 17 (10) ◽  
pp. 2817-2824 ◽  
Author(s):  
K. Rajan ◽  
W. Wallace ◽  
J. C. Beddoes
Keyword(s):  
Aluminium Alloy ◽  
Stress Corrosion ◽  
High Strength ◽  
Corrosion Resistant ◽  
Microstructural Study

Structure, mechanical properties, and stress corrosion behaviour of high strength spray deposited 7000 series aluminium alloy

1991 ◽  
Vol 7 (5) ◽  
pp. 447-451 ◽  
Author(s):  
R. Mächler ◽  
P. J. Uggowitzer ◽  
C. Solenthaler ◽  
R. M. Pedrazzoli ◽  
M. O. Speidel
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloy ◽  
Stress Corrosion ◽  
Corrosion Behaviour ◽  
High Strength

scholarly journals EXPERIENCE IN THE DEVELOPMENT AND USE OF ALUMINUM ALLOY CASING FOR CONDITIONS OF HIGH CONTENT OF ACID GASES IN FORMATION FLUIDS

2019 ◽  
Vol 121 ◽  
pp. 04013
Author(s):  
Vladimir Sledkov ◽  
Mikhail Gelfgat ◽  
Dmitry Basovich
Keyword(s):  
Aluminum Alloy ◽  
Aluminium Alloy ◽  
Weight Ratio ◽  
High Strength ◽  
Acid Gases ◽  
Construction Costs ◽  
Corrosion Resistant

When selecting a casing material for fields with a high content of H2S and CO2, it is recommended to use specialized corrosion-resistant tubulars with high content of chrome of the Sanicro 29 type. The high cost of the material can be critical for the project economy. A promising approach for these problems elimination could be the application of aluminium alloy casing pipes. They are remain inert to corrosion even if the formation environment is fully saturated with H2S and/or CO2. They are also lightweight, have high strength-to-weight ratio, and thus decrease the existing tensions in the string and reduce well construction costs.

Anodic Corrosion Characteristics of Aluminum 7075 and 7178

CORROSION ◽  
1967 ◽  
Vol 23 (9) ◽  
pp. 268-275 ◽  
Author(s):  
A. H. ROEBUCK ◽  
J. V. LUHAN
Keyword(s):  
Stress Corrosion ◽  
Natural Environment ◽  
Aerospace Industry ◽  
High Strength ◽  
Corrosion Process ◽  
Electrochemical Characteristics ◽  
Crystallographic Form ◽  
Accelerated Corrosion ◽  
Corrosion Resistant ◽  
Aluminum 7075

Abstract High-strength alloys 7075 and 7178 are widely used now in the −T6 tempers by the aerospace industry. Several more corrosion-resistant tempers have been developed recently: 7075–T73 (stress corrosion resistant) and 7075–T76 and 7178–T76 (exfoliation resistant). Electrochemical characteristics as determined by “dynamic” (current versus potential) and “static” (current versus time) tests were found to correlate well with their performance in accelerated corrosion and natural environment marine tests. Attack on the −T6 temper was found to be localized in nature, while that on the resistant tempers (−T76 and −T73) was general, showing crystallographic form. The −T6 tempers polarized more rapidly and were less active than the −T76 or −T73 tempers. Anodic control of the corrosion process is postulated to be more important in 7075 than in the more highly alloyed 7178; the latter showing mixed anodic-cathodic control.

Evaluating stress corrosion cracking behaviour of high strength AA7075-T651 aluminium alloy

2017 ◽  
Vol 26 (3-4) ◽  
pp. 105-112
Author(s):  
P. Prabhuraj ◽  
S. Rajakumar ◽  
A.K. Lakshminarayanan ◽  
V. Balasubramanian
Keyword(s):  
Aluminium Alloy ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Threshold Stress ◽  
High Strength ◽  
Constant Load ◽  
Corrosion Cracking ◽  
Time To Failure ◽  
Nacl Solution ◽  
Horizontal Type

AbstractThe objective of the present study is to determine the threshold stress level of stress corrosion cracking (SCC) in AA7075-T651 aluminium alloy by suitable experimentation. The test was carried out using a circumferential notch specimen in a horizontal-type constant load SCC setup in a 3.5 wt.% NaCl solution. The time to failure by SCC was determined at various loading conditions. The threshold stress of AA7075-T651 alloy was found to be 242 MPa in a 3.5 wt.% NaCl solution. The various regions of the fractured surface specimen such as machined notch, SCC region and final overload fracture area were examined using scanning electron microscopy (SEM) in order to identify the SCC mechanism.

Physical, Chemical, and Crystallographic Characterization of Anodic Coatings on High Strength Aluminum Base Alloys

1976 ◽  
Vol 34 ◽  
pp. 636-637
Author(s):  
R. E. Herfert ◽  
N. T. McDevitt
Keyword(s):  
Sulfuric Acid ◽  
Salt Spray ◽  
High Strength ◽  
Environmental Stability ◽  
Anodic Films ◽  
Sodium Dichromate ◽  
Corrosion Resistant ◽  
Aerospace Applications ◽  
Bond Strengths ◽  
Adhesive Bonded Joints

Durability of adhesive bonded joints in moisture and salt spray environments is essential to USAF aircraft. Structural bonding technology for aerospace applications has depended for many years on the preparation of aluminum surfaces by a sulfuric acid/sodium dichromate (FPL etch) treatment. Recently, specific thin film anodizing techniques, phosphoric acid, and chromic acid anodizing have been developed which not only provide good initial bond strengths but vastly improved environmental durability. These thin anodic films are in contrast to the commonly used thick anodic films such as the sulfuric acid or "hard" sulfuric acid anodic films which are highly corrosion resistant in themselves, but which do not provide good initial bond strengths, particularly in low temperature peel.The objective of this study was to determine the characteristics of anodic films on aluminum alloys that make them corrosion resistant. The chemical composition, physical morphology and structure, and mechanical properties of the thin oxide films were to be defined and correlated with the environmental stability of these surfaces in humidity and salt spray. It is anticipated that anodic film characteristics and corrosion resistance will vary with the anodizing processing conditions.

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