Relationship between Fatigue Properties and Surface Treatment of Aluminum Alloy
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Materials engineering (MPAEM), MSc
Publicerad
2023
Författare
Khan, Umair Ali
Zahedi, Soroosh
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Corrosion has posed a significant challenge within the maritime sector for numerous
years. In the 21st century, bolstering the corrosion resistance of alloys, particularly
aluminum alloys, has become paramount. Aluminum alloys find widespread use in
propulsion systems, boat hulls, and cargo vessels. However, their response to varying
water and atmospheric conditions can differ [1]. Different techniques, such as Surface
Acid Anodization (SAA) and Chromic Acid Anodization (CAA), are employed to
enhance alloy corrosion resistance. Nonetheless, research indicates that anodization
can lead to a reduction in fatigue strength of up to 30%.
This master’s thesis seeks to examine the effectiveness of three distinct aluminum
alloys, each produced through different manufacturing methods, using fatigue testing
before and after anodization. The aluminum variants under scrutiny include
EN AC-43100 aluminum cast in a permanent mold, AC-43400 produced via highpressure
die-casting, and 6014 sheet metal. The testing employed dog bone samples
with a servo fatigue test rig, utilizing the staircase fatigue method. The study also
delved into crack formation and microstructural characteristics of cross-sections to
investigate failure modes. The results of this investigation aim to lay the groundwork
for enhancing fatigue resistance in marine applications of aluminum alloys
while minimizing the potential loss of mechanical properties.
Beskrivning
Ämne/nyckelord
Corrosion resistance , Fatigue , Aluminium alloys , HPDC , PMC , Sheet Metal , Anodization Molding , Casting