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Corrosion Resistance Research on New Seawater Resistant Stainless Steel
Author: ZhouBo
Tutor: KouShengZhong
School: Lanzhou University of Technology
Course: Materials Processing Engineering
Keywords: stainless steel pitting corrosion crevice corrosion seawater resistant alloy elements casting
CLC: TG171
Type: Master's thesis
Year: 2009
Downloads: 504
Quote: 1
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Abstract
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In this paper,on the basis of research and development in the overseas.chage the formula for resistance stainless steel,use orthogonal design to confirm basic alloy elements and heat treatment.fusion technique of sample was proceeing in arc-melting furnace.Then take solution heat treatment and aging treatment,and do locality corrosion resistance immersion and electrochemical corrosion experiment.Then research corrosion resistance property of samples.The corrosion behavior of test stainless steel were studied by immersion weight loss method in FeCl3 aqueous solution and manual seawater and electrochemical method.The structure and corrosion properties of samples were examined by XRD,EMPA,SEM, metallographic structure observation,DSC,compression Stress-strain curve,the testing of rigidity and corrosion measuring system respectively.The result as follows. （1）In view of features that stainless steel in seawater envirment mostly occur pitting corrosion and crevice corrosion and that lose efficacy.At frist by means of 35℃,24h pitting resistance experiment,the experiment result is:Mn（%） > Cu（%） > V（%） > Si（%） > temperature of solution（℃） >temperature of aging treatment（℃）>time of solution（min）。the formula of new stainless steel show excellent corrosion resistance property is:Cr（20%） Ni（18%） Mo（6%） V（0.8%） Si（0.1%）,the other is Fe.mark as sample 1.The heat treatment system is:temperature of solution（1100℃）,time（120min）,cooling in the water;temperature of aging treatment（520℃）,time（4h）,cooling on the air.The rate of corrosion is 0.0826 mm/a. Do manual seawater immersion experiment,after 7 days the rate of corrosion is 0.05838mm/a,after 14 days the rate of corrosion is 0.04837 mm/a。（2）By means of 35℃,24h crevice resistance experiment,the experiment result is: Mn（%）>Cu（%）>Si（%）>temperature of solution（℃）>V（%）>time of solution（min） >temperature of aging treatment（℃）。the formula of new stainless steel show excellent corrosion resistance property is:Cr（20%） Ni（18%） Mo（6%） Mn（0.2%） V（1.5%） Si（0.8%）,the other is Fe.mark as sample 2.The heat treatment system is:temperature of solution（1100℃）, time（30min）,cooling in the water;temperature of aging treatment（520℃）,time（4h）,cooling on the air.The rate of corrosion is 0.2156 mm/a.Do manual seawater immersion experiment,after 7 days the rate of corrosion is 0.021715mm/a mm/a,after 14 days the rate of corrosion is 0.032148mm/a。Three kinds of immersion experiment indicate that the rate of corrosion of two test samples get good corrosion resistance compare with 316L.The result declare that two test samples have good corrosion resistance.But the rate of corrosion of two test samples get poor corrosion resistance compare with TC4.The manual seawater immersion experiment indicate that sample 2 have good corrosion resistance compare with sample 2,after 14 days immersion experiment,the etch pite of furface pattern of sample 2 is smoother than sample 1.
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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Theory of metal corrosion
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