International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 07 | July 2024
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p-ISSN: 2395-0072
INVESTIGATION ON CORROSION BEHAVIOUR OF FUNCTIONALLY GRADED CHROMIUM COATED MILD STEEL IN BOILER TUBES Dr.M.KANTHA SHOBA 1, Dr.A.SUJATHA2,KAMALESH.K3 1 Associate Professor, Department of Mechanical Engineering,
2 Assistant Professor(Sr), Department of Mechanical Engineering,
3 P.G Student, Department of Mechanical Engineering, Thanthai Periyar Government Institute of Technology, Vellore, Tamil Nadu , India. ---------------------------------------------------------------------***--------------------------------------------------------------------chromium sputtered mild steel with varied DC power Abstract -
supply are reported. Proper selection of parameters such as DC power supply, temperature, sputtering gas flow rate is important toachieve desired corrosion property.
Mild steel is one of the commonly used materials in all industries. But its limited corrosion resistance property makes its applications lesser .To expand its applications, its mechanical properties needs to be enhanced. One of the important ways to protect from corrosion problems is to coat with noble metals like chromium and its alloys. In this study, chromium was successfully coated on the mild steel substrate using DC magnetron sputtering technique. Experiments were carried out by varying DC power supply and all other parameters were kept constant. The corrosion properties of the chromium coated mild steel specimens were studied by conducting neutral salt spray test as per ASTM B117-19 standard. compared the results with substrate material.
2. MATERIALS AND METHODS: In this study, mild steel, a most common material for Boiler tube has been selected as the base metal. The base metal was processed into a square shape having a 50mm*50mm*5mm size. To investigate Corrosion properties, a total of 2 samples were prepared according to DC sputtering power. Chemical composition of mild steel is shown in the table 1.
Key Words: Mild steel, Chromium, DC magnetron sputtering, Corrosion properties.
1.INTRODUCTION Boiler tube materials require good heat transfer rate, mechanical strength and corrosion resistance to resist against the working fluids. Mild steel is a type of carbon steel which is one of the most commonly used material in manufacturing of boiler tube due its high thermal conductivity, affordability, strength and versatility. However, the major problem of mild steel is their lack of corrosion resistance. By improving the surface conditions the corrosion resistance, hardness of a material can be enhanced. Thus, to enhance the properties of the mild steel it needs to be covered with a protective layer or surface coating.
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Impact Factor value: 8.226
Amount wt %
Fe
98.81 – 99.26
Mn
0.30 – 0.65
Si
0.10 – 0.35
C
0.25 – 0.29
P
0.16 Ni
0.0071
Co
0.0013
Cu
0.0029
Sn
0.005
Table-1 Chemical Composition of Mild Steel
MATERIAL PROPERTIES OF CHROMIUM
Surface coating technique is generally used in most of the protective applications. Surface coating acts as a protective barrier for the material in its working environment. Physical vapour deposition is an important technique to improve the mechanical properties and corrosion resistance of a material. Various methods such as Sputtering, elctro deposition, Electro plating, pulsed ,laser deposition are most commonly used to produce thin films. Among these techniques, magnetron sputtering provides high adhesion, high absorption and more homogenous films. In this paper, corrosion behaviour of
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Element
Chromium is highly esteemed for its exceptional resistance to corrosion and its remarkable hardness. A significant breakthrough in the remarkable of steel manufacturing occurred when it was found that the addition of metallic chromium could render steel highly impervious to both corrosion and discoloration, resulting in the creation of stainless steel.
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