Study of some mechanical, oxidation, and corrosion properties of metal alloys used in manufacturing of petroleum towers

Other Title(s)

دراسة بعض الخصائص الميكانيكية و خواص الأكسدة و التآكل للسبائك المستعملة في صناعة أبراج تكرير النفط

Dissertant

al-Musawi, Layth Nazim Abbas

Thesis advisor

Hafad, Sanaa Abd al-Hadi

University

University of Technology

Faculty

-

Department

Applied Sciences Department

University Country

Iraq

Degree

Master

Degree Date

2011

English Abstract

-In this research the diffusion coating process by the single preparation method of (Al) metal, dual preparation method of (Al,Si) metals and third preparation method of (Al ,Si ,Cr ) metals on different alloys (Inconel alloy, Monel alloy, Stainless steel alloy type (316L), Stainless steel alloy type (321) and Low carbon steel alloy).

Which are used in the production of manufacturing of Petroleum towers such of carbon steel and alloy steel families.

All the heat chemical treatment in the (1100°C) and in the average period (20) hour per each treatment.

The effect of diffusion coating on alloys.

Can be seen in the microstructure test processes and X-ray diffraction test.

It is clear from the XRD test, the appearance of new phases for all coating alloys.

X-ray Fluorescence test, which appears metals contents showing the change in percentage in (Al, Si, Cr) alloys according to coating's method.

Microstructure test which is metal and alloy identity indicates the change inside the alloy due to Coating and Calculates the coating thickness for each phase.

In Monel alloy the thickness of Al coating was 400μm.

From hardness test by using Brunel method, we found that the hardness increase with all Kinds of coating.

For example, the hardness of Inconel alloy before coating was 179 Kg/mm2, increase to 255 Kg/mm2 with Aluminizing coating, 260 Kg/mm2 with Siliconizing-Aluminizing coating and 275 Kg/mm2 with Crninizing-Silcinazig-Aluminizing coating.

The results of the wear test for used alloys under constant weight (2kg) and for constant time(30min), Indicate that the wear rate decrease after coating processes.

It is clear from the results that the wear rate is less for third coating than the dual and single coating.

In the corrosion test process we used salt solution (NaCl).

For testing the alloy before and after coating the salt concentration in the salt water known as the most corrosive condition and the result show the resistance of alloys increased after coating.

Finally, Oxidation test for alloys in the air at (700°C) and rate (6 hour) for each period (totally 36 hours).

Shows an increase in the weight (thin film oxidation content) which then increase Oxidation resistant.

Main Subjects

Physics

Topics

• Oxidation
• Mechanical properties
• Alloys
• Minerals

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305387