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Journal of Materials Science & Technology 2008年第5期24卷 715-717页

作者： H.Hasannejad T.Shahrabi A.Sabour Rouhaghdam M.Aliofkhazraei Department of Materials Engineering Faculty of EngineeringTarbiat Modares University

One of the main problems of stainless steel is its poor pitting corrosion resistance in the aggressive environment containing Cl-, such as seawater. In this paper we investigated the corrosion behavior of the 316 stainless steel coated by cerium oxide nanocoating prepared by sol-gel process. Potentiodynamic polarization and electrochemical impedance spectroscopy （EIS） were used to study the corrosion behavior of cerium oxide nanocoatings in 3.5% NaCl solution. The microstructure of the cerium oxide was examined by scanning electron microscopy （SEM） and the formed phases was identified by X-ray diffraction （XRD）. The pitting corrosion resistance of the cerium oxide nanocoating was found to be improved after heat treatment of the cerium oxide nanocoating at 300℃ for 30 min.

关键词： Cerium oxide nanocoating Sol-gel pitting corrosion resistance 316 stainless steel

Improvement of pitting corrosion resistance for Al-Cu alloy in sodium chloride solution through equal-channel angular pressing

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Progress in Natural Science:Materials International 2011年第4期21卷 307-313页

作者： Dan SONG,Ai-bin MA,Jing-hua JIANG,Ping-hua LIN,Liu-yan ZHANG College of Mechanics and Materials,Hohai University,Nanjing 210098,China College of Mechanics and Materials Hohai University Nanjing 210098 China

Significant corrosion resistance improvement was achieved in solid-solution treated(T4) Al-Cu alloy after severe grain refinement through equal-channel angular *** bulk ultrafine-grained Al-Cu alloy with grain sizes of 200-300 nm has higher pitting potential(elevated by about 34 mV,SCE) and lower corrosion current density(decreased by about 3.88μA/cm~2) in polarization tests than the as-T4 alloy,and increased polarization resistance(increased by about 5.7 kΩ·cm~2) in electrochemical impendence spectrum tests,along with alleviated corrosion damage in immersion *** factors responds to the improved corrosion resistance of the alloy:the first is the refinement of residualθ-phase(Al2Cu) particles leading to the lower micro-galvanic currents and reduced susceptibilities to pitting corrosion,the second is the mass of strain-induced crystalline defects providing more nucleation sites for the formation of more volume fractions of stable oxide film.

关键词： Al-Cu alloy equal-channel angular pressing pitting corrosion resistance ultrafine-grained particle

Fabrication of high nitrogen austenitic stainless steels with excellent mechanical and pitting corrosion properties

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International Journal of Minerals,Metallurgy and Materials 2009年第4期16卷 387-392页

作者： Hua-bing Li Zhou-hua Jiang Yang Cao Zu-rui Zhang School of Materials and Metallurgy Northeastern University Shenyang 110004 China

A series of high nitrogen austenitic stainless steels were successfully developed with a pressurized electroslag remelting furnace. Nitride additives and deoxidizer were packed into the stainless steel pipes, and then the stainless steel pipes were welded on the surface of an electrode with low nitrogen content to prepare a compound electrode. Using Si3N4 as a nitrogen alloying source, the silicon contents in the ingots were prone to be out of the specification range, the electric current fluctuated greatly and the surface qualities of the ingots were poor. The surface qualities of the ingots were improved with FeCrN as a nitrogen alloying source. The sound and compact macrostructure ingot with the maximum nitrogen content of 1.21wt% can be obtained. The 18Cr18Mn2Mo0.9N high nitrogen austenitic stainless steel exhibits high strength and good ductility at room temperature. The steel shows typical ductile-brittle transition behavior and excellent pitting corrosion resistance properties.

关键词： high nitrogen austenitic stainless steels electroslag remelting nitrogen alloying ductile-brittle transition pitting corrosion resistance

22Cr High-Mn-N Low-Ni Economical Duplex Stainless Steels

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Journal of Iron and Steel Research International 2012年第2期19卷 50-56页

作者： JIANG Da-wei GE Chang-sheng ZHAO Xiang-juan LI Jun SHI Lu-lu XIAO Xue-shan Institute of Materials Shanghai University Shanghai 200072 China Jiangsu JosenSpecial Steel Products Co Ltd Xinghua 225721 Jiangsu China

A new family of economical duplex stainless steels in which N or Mn was substituted for Ni with composi- tion of 22Cr-8.0Mn-xNi-1.0Mo-0.7Cu-0.7W-0.3N （x = 0.5 -- 2.0） have been developed by examining the micro- structure, mechanical and corrosion properties of these alloys. The results show that these alloys have a balanced ferrite-austenite relation. In addition, the alloys are free of precipitation of sigma phase and Cr-nitride when solution- treated at 750 to 1300℃ for 30 min. The yield strength, tensile strength and fracture elongation values of experi- mental alloys solution-treated at 1050 ℃ for 30 min are about 500, 750 MPa and 40.0%, respectively. Low-temper- ature impact properties can be improved distinctly with the increase of nickel content. Among the designed DSS al- loys, the alloy with Ni of 2.0% is found to be an optimum alloy with proper phase proportion, better low-tempera- ture impact properties and higher pitting corrosion resistance compared with those o~ other alloys. The mechanical and corrosion properties and lower production cost of the designed DSSs are better than those of AISI 304.

关键词： economical duplex stainless steel low-temperature impact property pitting corrosion resistance

A New Series of Mo-free 21.5Cr-3.5Ni-xW-0.2N Economical Duplex Stainless Steels

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Journal of Iron and Steel Research International 2014年第1期21卷 69-75页

作者： Zi-xing ZHANG Qing-xuan RAN Yu-lai XU Xiao-jiang YU Da-wei JIANG Xue-shan XIAO Laboratory for Microstructures Institute of MaterialsShanghai University

A new series of economical Mo-free duplex stainless steels 21.5Cr-3.5Ni-xW-0. 2N （x = 1.8 -- 3. 0, mass%） have been developed. The effects of W on mechanical properties and corrosion resistance were investigated, and the microstructures were analyzed by optical microscopy, X-ray diffraction, transmission electron microscopy and electron backscatter diffraction. The designed steels have a balanced ferrite-austenite relation and are free of sigma phase after solution treatment at 750--1 300 ~C for 30 min followed by water-quenching, whereas a small number of Cr23 C~ precipitates were found after solution treatment at 750 ~C. After solution treatment at 1050 ℃, the steel with 1.8~ （mass percent） W exhibits the highest room temperature tensile strength due to the strongest work hardening effect, while the steel with 3.0% （mass percent） W exhibits the highest fracture elongation owing to the transformation-in- duced plasticity （TRIP） effect. The ductile-brittle transition （DBT） and martensite transformation are respectively found in the ferrite and austenite, which deteriorates the impact properties of the steels with the increase of W con- tent. The corrosion resistance of the designed steels is improved with the increase of W content. The pitting resistance of austenite is obviously better than that of ferrite for the designed alloys. Among the designed steels, the steel with 1.8% （mass percent） W is found to be an optimum steel with excellent comprehensive properties and lowest production cost.

关键词： economical duplex stainless steel tungsten mechanical property pitting corrosion resistance

Phase transition and pitting corrosion behaviour for Mo—implanted aluminium

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Chinese Physics B 2002年第3期11卷 272-276页

作者：张通和刘培英等 KeyLaboratoryinUniversityforRadiationBeamTechnologyandMaterialmodification InstituteofLowEnergyNuclearPhysicsBeijingNormalUniversityBeijing100875China DepartmentofMaterialsSci

Molybdenum ions are implanted into aluminium with high ion flux and high dose at elevated temperatures of200℃, 400℃ and 500℃. Due to the high temperature and high flux of vacancies and interstitial atoms, the atomdiffusion and chemical effects are enhanced during the ion implantation. The effects increase with increasing ion fluxand dose, so that new phase formation and phase transition emerge noticeably. X-ray diffraction analysisshows thatwhen the aluminium is implanted with Mo ions at a low ion flux (25μA/cm2), the Al5Mo alloy is *** atomicratio of Mo/Al of the Al5Mo phase is close to 20%. When the aluminium is implanted with Mo ions at a high ion flux(50μA/cm2), the phase transition from Al5Mo to Al12Mo appears, and the latter is dominant, which is determined tobe the final phase. The ratio of Mo/Al in Al12Mo is 7.7%. Rutherford backscattering spectroscopy indicates also thatthe Mo/Al atom ratio is ～7% to ～8% in Mo-implanted aluminium. The atomic ratios of the constituents in Al5Mo andAl12Mo are of stoichiometric composition for these alloys. The thicknesses of the Al12Mo alloy layers for Mo-implantedAl with ion doses of 3 × 1017/cm2 and 1 × 1018/cm2 are 550nm and 2000nm, respectively. The pitting corrosion potentialVp increases obviously. It is clear that due to the formation of Al12Mo alloy layer, the pitting corrosion resistance isenhanced.

关键词： Mo-implanted Al MoAl alloy phase transition pitting corrosion resistance

Influence of sulfur on inclusion and pitting resistance of 316L stainless steel

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Baosteel Technical Research 2020年第3期14卷 31-38页

作者： CHEN Dexiang QIANG Shaoming New Material Industry Innovation Center China Baowu Steel Group Co.Ltd.Shanghai 201999China Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

The effect of the sulfur content on the microstructure and inclusions of 316 L stainless steel was studied by optical microscopy,scanning electron microscopy,and image analysis,and the effect of sulfur on the pitting corrosion resistance of 316 L stainless steel was studied by conducting ferric chloride immersion test and plotting the electrochemical polarization *** results show that the added sulfur is mainly in the form of manganese sulfide inclusions in 316 L stainless *** increases in the sulfur content,the grade and percentage of the sulfide in the steel gradually increased,and its distribution became increasingly *** the sulfur content exceeded0.1%,the number of sulfide inclusions in the sample increased *** the sulfur content reached 0.199%,the sulfides in the steel were primarily in spindle form,and a large number of spindles were found to refine the grain size of 316 L stainless *** pitting corrosion weight loss rate of 316 L stainless steel increased with increases in the sulfur content,while the pitting potential gradually ***,the pitting potential of 316 L stainless steel rebounded when the sulfur content reached 0.199%,which may be related to the grain refinement of the test steel and requires further study.

关键词： stainless steel manganese sulfide pitting corrosion resistance pitting potential