THE EFFECT OF CHROMIUM AND MANGANESE ON THE MECHANICAL PROPERTIES AND CORROSION RESISTANCE OF Al-Si-Fe ALLOY IN 0.5M HCl SOLUTION
THE EFFECT OF CHROMIUM AND MANGANESE ON THE MECHANICAL PROPERTIES AND CORROSION RESISTANCE OF Al-Si-Fe ALLOY IN 0.5M HCl SOLUTION
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Date
2007-08
Authors
ABDULWAHAB, MALIK,
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Abstract
The effect of chromium and manganese on the mechanical properties and
corrosion resistance of Al-Si-Fe alloy was investigated. Alloys of varying
percentages of Chromium and Manganese from 0.1 to 0.5% (0.1, 0.2, 0.3, 0.4,
and 0.5%) with the percentages of iron and silicon kept constant were sand cast
into cylindrical test bars of dimension 20mm by 300mm. The mechanical
properties (Tensile strength, Hardness and impact energy) of the as-cast and
age-hardened alloy samples were determined. Also the corrosion characteristics
of the two categories of alloys (as-cast and age-hardened) in 0.5M HCl solutions
at room temperature (280C) over period of 480hrs were investigated by weight
loss method. The results obtained showed an increase in the tensile properties
and hardness for the two different alloys with increased Cr and Mn addition.
However, the age-hardened samples have improved tensile strength, ductility,
hardness, impact energy and corrosion resistance than the as-cast. For example,
the highest tensile strength value obtained in the as-cast and age-hardened
conditions for Cr is 79.90N/mm2 and 100.44N/mm2, Mn is 77.34 N/mm2 and
98.18 N/mm2, and MnCr is 82.81 N/mm2 and 103.23 N/mm2 respectively. Lowest
corrosion rate in the as-cast and age-hardened conditions was at 0.5% (Cr, Mn,
MnCr) additions. However, it was also observed that the corrosion rate decrease
with increase in the number of days of exposure time for all the alloys. These
could be attributed to the corrosion products, formed which tends to shield up
corroding surface resulting to a decrease in corrosion rate of the samples
investigated.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL IN
PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE
AWARD OF MASTER OF SCIENCE IN METALLURGICAL
ENGINEERING
DEPARTMENT OF METALLURGICAL ENGINEERING
FACULTY OF ENGINEERING
AHMADU BELLO UNIVERSITY
ZARIA NIGERIA
Keywords
EFFECTS,, CHROMIUM,, MANGANESE,, MECHANICAL PROPERTIES,, RESISTANCE,, Si-Fe ALLOY IN 0.5M HCl SOLUTION.