Improving the corrosion resistance of A514--Q steel surface with Ni--based alloy powder processed by laser cladding

目录

声明

摘要

Abstract

Table of Content

Chapter 1 Introduction

1．1 Corrosion of Steel Structures in Marine Environments Overview

1．1．1 Importance of Structural Steel in Ocean Engineering and its Applications

1．1．2 Offshore Structures

1．1．3 The Use of High Strength Steels

1．2 Corrosion Behaviors and Seawater Corrosion of Metals

1．2．1 Types of Marine Corrosion

1．2．2 Factors Influencing Corrosion

1．2．3 Types of Corrosion

1．3 Literature Review On Laser Cladding and Coating Materials

1．3．1 Laser Cladding／Clad Re-Melting

1．3．2 Important Input Parameters in Laser Cladding

1．3．3 Applications

1．3．4 Coating

1．3．5 Inference of Literature and Empirical Literature

1．4 Aim and Objectives of the Research

Chapter 2 Materials and Experimental Methods

2．1 Location

2．2 Materials

2．2．1 Experimental Procedure

2．2．2 Laser Cladding Experimentation

2．2．3 Micro-Structure and Scanning Electronic Microscopy(SEM)Test Preparation

2．4 Wearing or Friction Test Preparation

2．5 Micro Hardness Test Preparation

2．6 Electrochemical Corrosion Test Preparation

Chapter 3 Micrographs of Base Material and Experimental Samples

3．1．1 Pre-Placement Laser Method Experimental Samples

3．1．2 Powder Feeder Laser Method Experimental Samples

3．2 Phase Analysis Results

3．3 SEM and EDS Analysis Before Corrosion Test

3．3．1 Pre-Placement Laser Method Experimental Samples

3．3．2 Powder Feeder Laser Method Experimental Samples

3．3．3 Energy Dispersive Spectrometer(EDS)Results of Samples

Chapter 4 Properties of Base Material and Cladded Materials

4．1 Friction Test Results of Pre-Placed Method Experimental Samples of 300 Grams Load At Room Temperature

4．2 Friction Test Results of Powder Feeder Method Experimental Samples of 300 Grams Load At Room Temperature

4．3 Friction Test Results of Pre-Placed Method Experimental Samples of 500 Grams Load At High Temperature

4．4 Friction Test Results of Powder Feeder Method Experimental Samples of 500 Grams Load At High Temperature

4．5 Surface Hardness Test of Experimental Specimens

4．6 Electrochemical Corrosion Test Results and Analysis

4．6．1 Pre-Placement Laser Method Samples Corrosion Results

4．6．2 Powder Feeder Laser Method Experimental Samples Corrosion Results

Summary of chapter 4

Chapter 5 Conclusion and Recommendation

Acknowledgement

References