scholarly journals Effects of Si and Sn Contents and Heat-Treatment Temperature on the Corrosion Behavior of AISI 439 Ferrite Stainless Steel

2022 ◽  
Vol 60 (1) ◽  
pp. 26-34
Author(s):  
Chan Yang Kim ◽  
Do hyung Kim ◽  
Won sub Chung
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Passive Film ◽  
Heat Treatment Temperature ◽  
Inhibitory Effect ◽  
Heat Treatment Condition ◽  
Treatment Temperature ◽  
Fe Oxide ◽  
The Stability

This study was conducted to evaluate the corrosion resistance and optimize the heat-treatment process of AISI 439 ferrite stainless steel silicon and tin alloys with reduced chromium. The microstructure of the specimens and deposition under each condition were analyzed. The production of oxide films was compared based on the thickness of the film and the change in the contents of each element. In addition, electrochemical analyses of each heat-treatment condition was used to quantitatively compare corrosion resistance and passive film stability based on the relative chromium, silicon, and tin contents. It was found that the addition of silicon and tin compensated for the decrease in corrosion resistance induced by the chromium reduction. The addition of the two elements inhibited iron (Fe) oxide production in the surface oxide film, thereby improving the corrosion resistance of the material and improving the stability of the passive film. Moreover, the SiO2 and SnO2 layers inhibited the production of Fe oxide and contributed to the stability of the film along with Cr2O3, the main component of the passive film. However, when the heat treatment temperature increased above a specific temperature, the oxide inhibitory effect of the two elements was relatively offset. Nevertheless, further research to optimize the content of the three elements will help develop materials with superior mechanical properties and corrosion resistance.

Effect of cooling rate after heat treatment on pitting corrosion of super duplex stainless steel UNS S 32750

2018 ◽  
Vol 65 (5) ◽  
pp. 492-498 ◽  
Author(s):  
Byung-Hyun Shin ◽  
Junghyun Park ◽  
Jongbae Jeon ◽  
Sung-bo Heo ◽  
Wonsub Chung
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Cooling Rate ◽  
Pitting Corrosion ◽  
Heat Treatment Temperature ◽  
Secondary Phase ◽  
Treatment Temperature ◽  
Super Duplex Stainless Steel ◽  
Content Type

Purpose In this study, super duplex stainless steel (SDSS) was heat-treated. The purpose of this study is to assess the effect of the cooling rate after heat treatment on the pitting corrosion of SDSS. Design/methodology/approach The heat treatment from 1,000°C to 1,300°C was applied to SDSS to check the effect of the cooling rate. Findings The heat treatment temperature produced a different SDSS microstructure, and the cooling rate led to the growth of austenite. The casted SDSS indicated the presence of heterogeneous austenite, and the precipitation secondary phase under 1.6 per cent precipitated to bare metal. By applying heat treatment and cooling SDSS, its corrosion resistance changes because of the change in the chemical composition. The cooling rate at 5,600 J/s has the highest critical pitting temperature (CPT) at 1,100°C, and the cooling rate at 1.6 J/s has the highest CPT at 1,200°C. Low cooling rate (0.4 J/s) made the secondary phase at all temperature range. Research limitations/implications The effect of secondary phase not consider because that is well known to decreasing corrosion resistance. Practical implications Solution annealing is taken into account to optimize the corrosion resistance. But that is not consider the cooling rate at each temperature. This study assessed the effect of the cooling rate at each temperature point. Social implications Manufacturers need to know the effect of the cooling rate to optimize the corrosion resistance, and this study can be applied in the industrial scene. Originality/value SDSS is hard the optimization because SDSS is a dual-phase stainless steel. Corrosion resistance can be optimized by controlling heat treatment temperature and the cooling rate. Anyone not studied the effect of the cooling rate at each temperature. The effect of the cooling rate should be considered to optimize the corrosion resistance.

scholarly journals Corrosion resistance of UNS S31803 stainless steel welded joints

2018 ◽  
Vol 24 (2) ◽  
pp. 147
Author(s):  
Paolo Ferro ◽  
Jan-Olof Nilsson ◽  
Franco Bonollo
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Welded Joints ◽  
Heat Treatment Temperature ◽  
Experimental Tests ◽  
Treatment Temperature ◽  
Gas Composition ◽  
Shielding Gas ◽  
Heat Treated

<p>The corrosion resistance of duplex stainless steel welded joints is affected by different parameters such as filler metal chemical composition, heat input, shielding gas composition and post welding heat treatment temperature. In most cases such parameters interact with each other so that it is very difficult to foresee their effect on corrosion resistance of welded joints without specific experimental tests. In this work the best combination of shielding gas composition and post welding heat treatment temperature that guarantees the corrosion resistance of the joint according to ASTM  A932, method C, was found.  Two shielding gases were tested during welding, Ar (100%) and a mixture of Ar (87%), He (10%) and N (3%), while the solution temperatures were 1050 °C and 1070 °C.  It was found that only the samples welded with the mixture of Ar (87%), He (10%), N (3%) as shielding gas and solution heat treated at 1070 °C passed the corrosion test completely.</p>

Study of Electroless Plating Ni-B Composite Coating and its Properties

2011 ◽  
Vol 339 ◽  
pp. 261-264
Author(s):  
Huan Yang ◽  
Shi Qiu ◽  
Yu Feng Lu ◽  
Xiao Li Yin ◽  
Zhen Xing Liu
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Composite Coating ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
High Corrosion Resistance ◽  
Plating Solution ◽  
The Stability ◽  
Coating Hardness

The properties of Ni-B composite coating and corrosion resistance on the surface of 45 steel were investigated in this paper. An optimal component of plating solution was determined by the measurements of the stability of different component of plating solution and coating hardness as well as corrosion rate under different heat treatment temperature. The experimental results indicated that, when the heat treatment temperature was 300°C, the coating hardness reached 257HV and the corrosion rate was less than 0.15g•m-1•h-1, therefore the coating possessed high corrosion resistance.

Phase Transformation, Microstructure and Hardness of Electrodeposited Fe-Based Amorphous Coatings

2011 ◽  
Vol 467-469 ◽  
pp. 365-368
Author(s):  
Yun Ying Fan ◽  
Ye Hua Jiang ◽  
Rong Zhou
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Corrosion Resistance ◽  
Phase Transformation ◽  
Heat Treatment Temperature ◽  
High Hardness ◽  
Treatment Temperature ◽  
Dispersed Phase ◽  
Good Corrosion Resistance ◽  
Amorphous Coatings

Fe-based amorphous coatings have many excellent performances, such as good corrosion resistance, high hardness, satisfactory magnetism, etc. In this paper, Fe-P amorphous coatings were prepared by electrodeposition method, and the phase transformation, microstructure, and hardness of the coatings heated at different heat-treatment temperature were investigated. The results show that Fe-P amorphous coatings begin to crystallize when heated at 300°C, the α-Fe(P) solid solution appears when heated at 330°C, and FexP(X=1,2,3) compounds separate out from the solid solution when heat-treatment temperature is up to 370°C. During the process of heat-treatment, hardness of the Fe-P coating increases as the reinforcement result of solid solution and dispersed phase in the coatings, and the hardness reaches the maximum 1100 HV at 370°C. When heat-treatment temperature is higher than 460°C, dispersed phase in the coatings will grow up, which is called Ostwald Coarsening Phenomenon, and hardness of the coating decreases quickly.

scholarly journals Influence of Different Heat Treatment Temperatures on the Microstructure, Corrosion, and Mechanical Properties Behavior of Fe-Based Amorphous/Nanocrystalline Coatings

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 858
Author(s):  
Shenglin Liu ◽  
Yongsheng Zhu ◽  
Xinyue Lai ◽  
Xueping Zheng ◽  
Runnan Jia ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Heat Treatment Temperature ◽  
Annealing Treatment ◽  
Treatment Temperature ◽  
X Ray Diffraction ◽  
Crystalline Phases ◽  
X Ray ◽  
Different Temperatures ◽  
Sprayed Coating

Fe-based amorphous/nanocrystalline coatings with smooth, compact interior structure and low porosity were fabricated via supersonic plasma spraying (SPS). The coatings showed outstanding corrosion resistance in a 3.5% NaCl solution at room temperature. In order to analyze the effect of annealing treatment on the microstructure, corrosion resistance and microhardness, the as-sprayed coating was annealed for 1 h under different temperatures such as 350, 450, 550 and 650 °C, respectively. The results showed that the number of oxides and cracks in the coatings presented an obvious increase with increasing annealing temperature, and the corrosion resistance of the coatings showed an obvious reduction. However, the microhardness of coatings showed an important increase. The microhardness of the coating could reach 1018 HV when the heat treatment temperature reached 650 °C. The X-ray diffraction (XRD) results showed that there appeared a number of crystalline phases in the coating when the heat treatment temperature was at 650 °C. The crystalline phases led to the increase of the microhardness.

Effect of Heat Treatment on Hardness of Electroless Ni-P Plating

2011 ◽  
Vol 228-229 ◽  
pp. 878-882
Author(s):  
Guan Jun Liu ◽  
Xin Hua Mao ◽  
Jun Cao ◽  
Zhou Yu
Keyword(s):  
Heat Treatment ◽  
Heat Treatment Temperature ◽  
Phosphorus Content ◽  
Treatment Time ◽  
Design Method ◽  
Uniform Design ◽  
Heat Treatment Condition ◽  
Treatment Temperature ◽  
Heat Treatment Time ◽  
Alloy Plating

Hardness of electronless Ni-P alloy plating which have five different phosphorus content were investigated with HX-1000 type microscopic Vickers hardness tester, respectively. Phosphorus content of Ni-P platings were investigated by Quanta 200 type scanning electron microscope and Oxford Energy Disperse Spectroscopy Heat treatment temperature and time of the different platings were optimized and analysed by Uniform Design method, respectively. The results show that correlation consist between maximum hardness of the Ni-P alloy plating and heat treatment temperature, not heat treatment time under the experimental condition which the heat treatment time is between one hour and five hours, and maximal value of the plating hardness appears when the heat treatment temperature is 400-430 Celsius degree. Maximal hardness value of the electronless Ni-P alloy plating increases with increase of their phosphorus content under heat treatment condition.

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