High-Temperature Corrosion of Cast Iron

Corrosion ◽  
1976 ◽  
pp. 7:47-7:57
Author(s):  
H.H. COLLINS
Keyword(s):  
Cast Iron ◽  
High Temperature ◽  
High Temperature Corrosion

High temperature corrosion behaviour of aluminised FC 25 cast iron using pack cementation

2019 ◽  
Vol 66 (2) ◽  
pp. 236-241 ◽  
Author(s):  
Somrerk Chandra-Ambhorn ◽  
Neramit Krasaelom ◽  
Tummaporn Thublaor ◽  
Sirichai Leelachao
Keyword(s):  
Cast Iron ◽  
High Temperature ◽  
Corrosion Behaviour ◽  
Mass Gain ◽  
High Temperature Corrosion ◽  
Pack Cementation ◽  
X Ray Diffraction ◽  
Content Type ◽  
X Ray ◽  
Seat Insert

Purpose This study aims to apply the pack cementation to develop the Fe-Al layers on the surface of FC 25 cast iron in order to increase the high-temperature corrosion resistance of the alloy. Design/methodology/approach Pack cementation was applied on the surface of FC 25 cast iron at 1,050°C. The bare and aluminised alloys were subjected to the oxidation test in 20 per cent O2-N2 at 850 °C. Scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy and X-ray diffraction (XRD) were used for characterisation. Findings The layers of pack cementation consisted of Fe2Al5, FeAl2 and FeAl, and solid solution alloyed with Al. The oxidation kinetics of the bare cast iron was parabolic. Mass gain of the aluminised cast iron was significantly decreased compared with that of the bare cast iron. This was because of the protective alumina formation on the aluminised alloy surface. Al in the Fe–Al layer also tended to be homogenised during oxidation. Originality/value Even though the aluminising of alloys was extensively studied, the application of that process to the FC 25 cast iron grade was originally developed in this work. The significantly reduced mass gain of the aluminised FC 25 cast iron makes the studied alloy be promising for the use as a valve seat insert in an agricultural single-cylinder four-stroke engine, which might be run by using a relatively cheaper fuel, i.e. LPG, but as a consequence requires the higher oxidation resistance of the engine parts.

High Temperature Corrosion Problems In the Reduction of Nickel Copper Ores

CORROSION ◽  
1960 ◽  
Vol 16 (6) ◽  
pp. 286t-288t
Author(s):  
R. J. LAW
Keyword(s):  
Cast Iron ◽  
High Temperature ◽  
Stainless Steels ◽  
Ductile Iron ◽  
High Temperature Corrosion ◽  
Proper Selection ◽  
Processing Equipment ◽  
Nickel Copper ◽  
Copper Ores ◽  
Selection Of

Abstract A review is given of certain high temperature corrosion problems involved in the reduction of Canadian-mined nickel copper ores. Emphasis is placed on the proper selection of materials for various pieces of mining and processing equipment. Among the pieces of equipment discussed are roasters (superimposed on reverberatory furnaces), converters, lute caps, piping, drag line conveyors, sinter machines and hot crusher rolls. Materials of construction tested include cast iron, cast 28 chromium-3 nickel, 25 chromium-12 nickel, ductile iron, 13 chromium-0 nickel, 26 chromium-46 nickel-5 tungsten, and Types 431 and 410 stainless steels. 8.10.3

scholarly journals High Temperature Corrosion Behaviour of Aluminide-Coated Cast Iron for an Exhaust Manifold Application

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 705
Author(s):  
Panya Kerdbua ◽  
Mohammad Hassan Shirani Bidabadi ◽  
Walairat Chandra-ambhorn ◽  
Somrerk Chandra-ambhorn
Keyword(s):  
Cast Iron ◽  
High Temperature ◽  
Water Vapour ◽  
Corrosion Behaviour ◽  
Combustion Process ◽  
High Temperature Corrosion ◽  
Exhaust Manifold ◽  
Gas Temperature ◽  
Hydroxyl Ion ◽  
Aluminide Layer

To reduce the pollution emission from vehicles, an improvement on the combustion process is expected, leading to increased exhaust gas temperature. As a result, the development of new materials for an exhaust manifold used at higher temperatures is required. A cost-effective cast iron exhaust manifold treated by aluminising pack cementation was developed in the present work to combat the high temperature corrosion. Its kinetics under cyclic oxidation in N2–12%O2–10%H2O at 850 °C was parabolic with the rate constant (kp) of 5.66 × 10−12 g2 cm–4 s–1, about two orders of magnitude lower than that of the bare cast iron, which indicated the protectiveness of the applied coating. These results relate to the protective alumina formation for the aluminised cast iron and the formation of the less protective iron oxides for the bare cast iron after oxidation, as evidenced by the XRD and Raman spectroscopy results. The addition of 10% water vapour to N2–12%O2 thickened the aluminide layer from 344 μm for the sample oxidised in dry atmosphere to 409 μm for the sample oxidised humidified one. It accelerated the oxidation rate of the aluminised cast iron as the kp value increased by 8.5 times, and also increased the hardness of the aluminised surface, as it was 364 HV for the sample exposed to dry atmosphere and 420 HV for the sample exposed to humidified one. The latter result implied the possibility of the hydrogen dissolution into the metal surface. The roles of hydroxyl ion and dissolved hydrogen on the oxidation and evolution of the aluminide layer after exposure to water vapour were proposed.

High-temperature Corrosion of Cast Iron

Corrosion ◽  
1994 ◽  
pp. 7:53-7:66
Author(s):  
H.H. COLLINS ◽  
G.N.J. GILBERT
Keyword(s):  
Cast Iron ◽  
High Temperature ◽  
High Temperature Corrosion
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