Oxidation behavior of aluminide coatings on carbon steel with and without electrodeposited Ni–CeO2 film by low-temperature pack cementation

Vacuum ◽  
2011 ◽  
Vol 86 (2) ◽  
pp. 210-217 ◽  
Author(s):  
Y.B. Zhou ◽  
H.T. Hu ◽  
H.J. Zhang
Keyword(s):  
Carbon Steel ◽  
Low Temperature ◽  
Oxidation Behavior ◽  
Pack Cementation ◽  
Aluminide Coatings ◽  
Ceo2 Film

Effect of Pack Cementation Temperature on Oxidation Behavior of NiCoCrAl Coated Layer

2015 ◽  
Vol 1112 ◽  
pp. 353-358 ◽  
Author(s):  
Eni Sugiarti ◽  
Kemas A. Zaini ◽  
Yong Ming Wang ◽  
Naoyuki Hashimoto ◽  
Somei Ohnuki ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Oxidation Rate ◽  
Oxidation Behavior ◽  
Oxidation Mechanism ◽  
Intermediate Stage ◽  
Pack Cementation ◽  
Coated Sample ◽  
Initial Oxidation ◽  
Oxidation Stage ◽  
And Diffusion

The oxidation behavior of NiCoCrAl coatings deposited on carbon steel was evaluated at 800 °C for 100 h in atmospheric air. The effect of different coating process on the oxidation of carbon steel was studied. The oxidation mechanism was discussed based on oxidation rate, formation of oxide scale, and microstructure of the coated sample. The oxidation rate significantly increased owing to the formation of metastable Al2O3 during initial oxidation stage. The oxidation rate decreased due to the transformation from d, q to a-Al2O3 from the intermediate stage up to final stage of 100 h oxidation. The effect of pack cementation temperature contributed to the thickness and diffusion of coated elements. The experimental results showed that sample developed at 800 °C exhibited better oxidation resistance than sample developed at 900 and 1000 °C.

Development and Oxidation of RexOy-Modified Aluminide Coating

2010 ◽  
Vol 142 ◽  
pp. 274-278 ◽  
Author(s):  
Jing Chong Zhang ◽  
Yue Bo Zhou
Keyword(s):  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Aluminide Coating ◽  
Composite Films ◽  
Pack Cementation ◽  
Reactive Element ◽  
Aluminide Coatings ◽  
Subsequent Step ◽  
Oxidation In Air

Reactive reactive element oxide RexOy (Re=Ce, Y)-modified aluminide coatings have been developed by the first step of co-electrodeposition of Ni with CeO2 or Y2O3 particls on pure Ni and the subsequent step of diffusional aluminizing on electrodeposited Ni-CeO2/or Y2O3 composite films using pack cementation method at 1100OC for 4 hr. By comparison, aluminizing was also performed with the same condition on an as-deposited Ni film without RexOy particles. The oxidation in air at 900OC indicated that the RexOy (Re=Ce, Y)-modified aluminide coatings were profoundly oxidation resistance as compared to the RexOy (Re=Ce, Y)-free coatings. The effect of CeO2 or Y2O3 on the oxidation behavior is discussed in detail.

Factors Influencing Dephosphorization of Low Carbon Steel in Converter

2021 ◽  
Vol 1047 ◽  
pp. 111-119
Author(s):  
Zhao Liu ◽  
Shu Sen Cheng ◽  
Liang Wang
Keyword(s):  
Carbon Steel ◽  
Low Temperature ◽  
Slag Composition ◽  
Phosphorus Content ◽  
Low Carbon Steel ◽  
Smelting Process ◽  
Low Carbon ◽  
Factors Influencing ◽  
High Basicity ◽  
Metal Yield

A 300-metric ton converter in a steel plant in China was studied. The influence of factors such as slag composition and temperature in the smelting process on the dephosphorization effect was statistically analyzed. The dephosphorization ability of slag increased firstly and then decreased with the increase of temperature, basicity and FeO content. Low-temperature, high-basicity and high-oxidizing slag are thermodynamically beneficial to promote the dephosphorization reaction, but the basicity is higher than 4.0, and the temperature is higher than 1640 °C are not conducive to the slag to obtain better fluidity. At the same time, too high FeO content will increase the activity coefficient of P2O5, thereby increasing its activity, which is not conducive to the progress of the dephosphorization reaction. As the end point content of carbon decreases, the oxygen content increases and the phosphorus content decreases. A very low carbon content is not conducive to metal yield and temperature control.

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