Study Of Structure, Microstructure And Corrosion Properties Of AISI 304 Toward Marine Specification
AISI 304 is known as austenite stainless steel which has Face Centre Cubic (FCC) structure. AlSl 304 is the conventional stainless steel that had been applied in marine construction application. It is important to study the corrosion properties of AISI 304 due to the corrosion attack. Two type of...
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| Format: | Monograph |
| Published: |
UTeM
2009
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| Online Access: | http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000052190 http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000052190 http://eprints.utem.edu.my/3766/1/Study_Of_Structure%2C_Microstructure_And_Corrision_Properties_Of.._-__24_pages.pdf http://eprints.utem.edu.my/3766/2/Study_Of_Structure%2C_Microstructure_And_Corrision_Properties_Of.._-_TA479.S7_.M57_2009.pdf |
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| Summary: | AISI 304 is known as austenite stainless steel which has Face Centre Cubic (FCC)
structure. AlSl 304 is the conventional stainless steel that had been applied in marine
construction application. It is important to study the corrosion properties of AISI 304
due to the corrosion attack. Two type of corrosion attack that commonly can be
found on AlSI 304 steel, which respectively are pitting and intergranular corrosion.
Pitting corrosion occurs due to the attack of the corrosive environment to the
heterogeneous material composition on the surface of the AlSI 304 where at the
surface region, black spot that contain high iron wiU ease attack by localize corrosion
and form pitting. lntergranular corrosion is occurring when AISI 304 is exposed to
the beat at temperature 500 °C to 800 °C and slow quenching process. The process of
rapid quenching can cure the intergranular corrosion in AISI 304. The formation of
the respective corrosion is studied by using electrochemical analysis and weight loss
analysis respectively. The formation of pitting corrosion and the behaviour of AISI
304 to resist pitting corrosion is studied by applying effect on temperature test and
effect of pH. In this study, at high temperature, and more acidic solution, the pitting
corrosion attack is increased. Potentiodynamic Cyclic Polarization and Tafel applied
in analyzing this fonnation of pitting and the behaviour of AISI 304 in resisting
corrosion. According to ASTM A 262-01, practice C, susceptibility to intergranular
corrosion attack on AISl 304 is investigate. In this study, intergranular corrosion is
jnvestigated by exposing AISI 304 at temperature 677 °C. Based on the experiment it
shows that after AISI 304 exposed to 677 °C, AJSI 304 is susceptible attacked to
irrtergranular corrosion. The same result is shows when exposed AISI 304 is
quenched at slow quenching process. Rapid quench bad been improving corrosion
behaviour of AISI 304 in resisting intergranular corrosion. The corrosion product
that had been propagates on surface of AISI 304 was analysed by Scanning Electron
Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS). Energy Diffraction X-ray (XRD) analysis is applied to analyze the phase of Chromium
Carbide form in the structure of AISI 304. This formation had been analyzed that this
phases causing susceptibility to intergranular corrosion in AlSI 304. Based on the
marine specification, AISI 304 is not suitable applied in direct exposed to marine
environment because this material cannot resist corrosion attack due to cWoride
attack and ease to form chromium carbide in AlSI 304 structure due to the exposed
heat such welding process. Based on the study, corrosion rate AISl 304 in Melaka
seawater is 0.019 mm/year. Marine specification to the alloy that can resist corrosion
attack, the corrosion rate of the alloy should not exceed to 0.01 mm/year. |
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