TITLE:
Predictability of Al-Mn Alloy Exposure Time Based on Its As-Cast Weight and Corrosion Rate in Sea Water Environment
AUTHORS:
Chukwuka Nwoye, Simeon Neife, Ebere Ameh, Awo Nwobasi, Ndubuisi Idenyi
KEYWORDS:
Prediction; Exposure Time; Al-Mn Alloys; Sea Water; Alloy As-Cast Weight; Corrosion Rate
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.1 No.6,
November
26,
2013
ABSTRACT: This paper presents the predictability of aluminium-manganese alloy exposure time based on its as-cast weight and corrosion rate in sea water environment. The validity of the derived model: α = 26.67γ + 0.55β－ 0.29 is rooted on the core expression: 0.0375α = γ + 0.0206β－ 0.0109 where both sides of the expression are correspondingly approximately equal. Statistical analysis of model-predicted and experimentally evaluated exposure time for each value of as-cast weight and alloy corrosion rate considered shows a standard error of 0.0017% & 0.0044% and 0.0140% & 0.0150% respectively. The depths of corrosion penetration (at increasing corrosion rate: 0.0104 - 0.0157 mm/yr) as predicted by derived model and obtained from experiment are 0.7208 × 10－4 & 1.0123 × 10－4 mm and 2.5460 × 10－4 & 1.8240 × 10－4 mm (at decreasing corrosion rate: 0.0157 - 0.0062 mm/yr) respectively. Deviational analysis indicates that the maxi- mum deviation of the model-predicted alloy exposure time from the corresponding experimental value is less than 10%.