The Effect Of Angular Stress Performance On The Performance Of A Nickel Electroplated Steel Substrate In A Corrosive Environments

Investigation of the low carbon steel bends into different angles with dimension 50 mm X 20 mm and

then plated in Nickel bath at 3V for 25 minutes subjected to NaCl and H2SO4 corrosive environment.

This research investigated the corrosion resistance of nickel- plated and un-plated low carbon steel

and in a corrosive environment of H2SO4 and NaCl solutions. Weight loss method was used for

estimation the corrosion rate in the current study. Low carbon steel sample was nickel electroplated at

3V for 25 minutes. Plated and the un-plated carbon steel sample were subjected to H2SO4 and NaCl

environment for fifteen days. The electrode potentials, in mV (SCE), were measured every day.

Weight loss was determined at intervals of 2 days for the duration of the exposure period.

Electrodynamics experiment was performed. This provides the information that the potential drop was

in the range of -322 to -622 mV SCE for the 30-degree angle which shows more electronegative

potentials that it corrodes faster compared to sample 180 degree of potential range of -353 to -545

which denote reduced corrosion activity. The corrosion rate plots ascertain the corrosion behavior is a

sample of angle 30 and 180 degree.

The Tafel plots to determine the current densities were obtained, results show the highest corroded

and the least corroded sample in NaCl. The corrosion potential of 180- degree is higher than that of

30- degree, passivation occurring due to a coated Nickel substrate.

The stress effect and acidic solution accelerate the failure or fracture points because of increasing of

cracks propagation

Table of Contents 

Cover Page                   i 

Certification                   ii 

Dedication                   iii 

Acknowledgements                 iv 

Table of Contents               v 

List of Tables                 viii 

List of Figures                x 

Abstract                   xiii 

Chapter one 

1.0  Introduction……………………………………………………. 

1.1  The aim of research…………………………………………………. 

1.2  Objectives of the research………………………………… 

1.3  The scope of research……………………………………………… 

1.4  Expected contributions to knowledge ………………. 

1.5  Justification……………………………………………………… 

Chapter two 

2.0  Literature review…………………………………………….   

2.1  Forms of corrosion…………………………………………. 

2.1.1  Uniform corrosion………………………………. 

2.1.2  Intergranular corrosion……………………… 

2.1.3  Galvanic corrosion………………………………. 

2.1.4  Crevice corrosion…………………………………. 

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2.1.5  Pitting corrosion…………………………………. 

2.1.6  Erosion corrosion…………………………………. 

2.1.7  Stress corrosion cracking……………………. 

2.1.8  Selective leaching………………………………… 

2.2  Factors affecting corrosion……………………………. 

2.2.1  Temperature and velocity between the metal and the media…………... 

2.2.2  Surface finish and grain size………………… 

2.2.3  Stress and coating………………………………. 

2.2.4  Nature of the corrosion product…………. 

2.2.5   effect of oxygen………………………………… 

2.2.6  Types of iron and steel………………………… 

2.2.7  Influence of heat treatment………………. 

2.3  Fatigue 

2.3.1  Strain limitations………………………………. 

2.3.2  Residual stresses……………………………....... 

2.3.3  Thermal properties of steel………………… 

2.4  Surface treatments 

2.4.1  Electroplating……………………………………     

2.4.2  Electroless plating……………………………. 

2.4.3  Chemical process (chemical coating) …… 

2.4.4  Anodic oxidation process……………………. 

2.4.5  Hot dip coating…………………………………… 

2.4.6  Vaccum plating…………………………………. 

2.4.7  Plating………………………………………………. 

2.4.8  Thermal plating…………………………………. 

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