Matric part 1 chemistry, corrosion and its prevention ch 7 9th class chemistry duration. These are some of the differences between rust and corrosion. Corrosion is a naturally occurring phenomenon and just like all natural processes, corrosion of materials is spontaneous and it drives the materials to its lowest possible energy states. Factors affecting during materials selected for pharmaceutical plant construction, theories of corrosion, types of corrosion and there prevention. Corrosion engineering is the field dedicated to controlling and preventing corrosion in the most common use of the word, this means.
I used this lesson with a class of mixed ability working at grades 47. It is the gradual destruction of materials usually a metal by chemical andor electrochemical reaction with their environment. The authors emphasize the engineering aspects of corrosion and its control in ways that will be helpful to the practicing engineer. Average composition of seawater major ionic species 35 ppt 64,65. A presentation covering the various methods of prevention of corrosion. The composition of mild steel varies along its length and potential anodic more negatively charged and cathodic positively charged sites can be set up at.
The rusting of iron is characterized by the formation of a layer of a red, flaky substance that easily crumbles into a powder. Introduction corrosion is a process of formation of the compound of pure metal by the chemical reaction between metallic surface and its environment. Ppt corrosion powerpoint presentation free to download. Chapter i introduction to corrosion and corrosion inhibitors 1 introduction to corrosion and corrosion inhibitors section i. Corrosion is the deterioration of materials by chemical interaction with their environment.
Electrochemical nature of aqueous corrosion for metallic materials, the corrosion process is normally electrochemical, that is, a chemical reaction in which there is transfer of electrons from one chemical species to another. The types of corrosion and corrosion damage, causes of destruction and degradation of various materials, methods of preventing corrosion. Introduction corrosion is the destructive attack of a material by reaction with its environment. Each branch of the military has its corrosion program designed explicitly for its equipment requirements. Rust or rusting can affect only iron and its alloys. Ferrous and nonferrous metals, inorganic and organic non metals, material of pharmaceutical plant construction, corrosion and its prevention, hktechnical, phims rohtak, college of pharmacy pgims rohtak, pt bd sharma university of health science, hk. Corrosion and its prevention class 10 video edurev.
The process has been around for more than 250 years and has been used for corrosion protection of things like artistic sculptures and playground equipment. Corrosion results in the formation of the oxides of metal or salts. Topics covered include corrosion economics, detecting and monitoring corrosion, regulations, specifications, safety, and the selection and use of materials, with special emphasis on stainless steels. Corrosion and its prevention cbse class 10 x science hello students, here in this video we are going to study a very important topic as corrosion and it s prevention from cbse class 10 science. Eminent scientists, engineers, and researchers have been successful over the years in overcoming this menacing problem. Metals are good conductors of electricity, and if the environment with which they are in contact is also conductive, then corrosion will occur via an electrochemical process. Marine corrosion and its prevention in small vessels. The serious consequences of the corrosion process have become a problem of worldwide significance.
The iron in the steel reacts with the zinc to create a tightlybonded alloy coating which serves as protection. There is extensive structuring and it is designed for short chunked sections. Chapter 1 introduction to corrosion and its prevention. A sacrificial anode is used to protect metal structures. This chapter presents important aspects of corrosion in industrial infrastructure, its causes, impacts, control, protection and prevention methods.
Atmospheric corrosion of iron and steels is electrochemical in nature in opposition to dry oxidation 911. Corrosion mechanical engineering mcq questions and answers. Created by the best teachers and used by over 51,00,000 students. Corrosion control and prevention authorstream presentation. Corrosion prevention tax credit corrosion prevention tax credit nace corrosion 2006 front page issues march th, 2006 san diego, california powerpoint ppt presentation free to view corrosion types and its prevention corrosion is the deterioration of a metal as a result of chemical reactions between it and the surrounding environment. Corrosion corrosion is the disintegration of a material into its constituent atoms due to chemical reactions with its. Corrosion is the gradual destruction of material, usually metals, by chemical reaction with its environment. This prevents oxidation of the iron and protects the iron object from corrosion. Nevertheless, periodical assessments are done to achieve the current level of. The term corrosion is sometimes also applied to the. Corrosion is the degeneration of materials by reaction with environment.
Corrosion prevention an overview sciencedirect topics. Corrosion and its prevention cbse class 10 x science. Corrosion and its prevention part 1 engineering youtube. We also examine the chemical basis for some common methods for preventing corrosion and treating corroded metals. The corrosion of steel reinforcement in concrete is complex, but basically it is an electrochemical reaction similar to that of a simple battery. Energy for the world discussion points corrosion types corrosion control methods corrosion testing methods. In the most common use of the word, this means electrochemical oxidation of metals in reaction with an oxidant such as oxygen. Materials in industry metallic materials play a key role in the development of a country and its sustained growth in the context of the global economy.
This causes a lot of damage to car bodies, ships, bridges, iron railings and to all objects made of iron. Corrosion is a natural process that converts a refined metal into a more chemicallystable form such as oxide, hydroxide, or sulfide. One way to avoid these problems is to use a more easily oxidized metal to protect iron from corrosion. Explain the process of corrosion, issues with corrosion and methods of prevention. Simo olavi pehkonen, shaojun yuan, in interface science and technology, 2018. Corrosion and its prevention electrochemical interpretation. In this process, metals lose their metallic properties. Webcorr has nace certified corrosion specialist providing corrosion training. Corrosion and its prevention electrochemical interpretatio 1 corrosion and its prevention electrochemical interpretation gomathikannadhasan nccr,iitm chennai 2 introduction.
In this approach, called cathodic protection, a more reactive metal such as zn e. The electrochemical nature of corrosion can be illustrated by the attack of zinc by hydrochloric acid. Corrosion phenomenon causing the impairment of the metal function, of the environment or of the technical system of which they form a part. Pitting corrosion is most likely to be found just under the areas where these deposits have accumulated over time.
When zinc is placed in dilute hydrochloric acid a vigorous reaction occurs. The influence of heat transfer on metal protection with volatile corrosion inhibitors vcis, the mechanisms of corrosion initiation, and methods for its prevention were analyzed. Difference between rust and corrosion is corrosion and. Corrosion of steel reinforcement in concrete causes and. In this topic, corrosion and its prevention are explained i. Corrosion in the oil and gas industry is not a static phenomenon, and therefore its prevention presents numerous challenges. Paper presentation on corrosion and its prevention presented by department of mechanical engineering.
It covers phenomenon and types of corrosion and its prevention. In a previous post, we discussed the basics of corrosion from the fundamental chemical reaction to the types of environments in which corrosion can occur. In this lecture we will explore the process by which corrosion takes place and the different ways unwanted corrosion. The vapour pressure of amines is ideal so that the vci will be present in both phases and provide ideal coverage for the pipeline. Corrosion and its prevention electrochemical interpretation ppt. This chapter focuses on corrosion and its prevention. Namboodhiri professor of metallurgy retired introduction definition. Corrosion and its prevention class 10 video edurev, summary, previous year questions with solutions, mock tests for examination, practice quizzes, video lectures, important questions, extra questions, viva questions, ppt, sample paper, objective type questions, mcqs, pdf, past year papers, shortcuts and tricks, corrosion and its prevention. This 5day course provides an excellent avenue for corrosion practitioners, failure analysis personnel, designers, technical managers, inspection and maintenance engineers, coatings and weld inspectors, quality control personnel and anyone who is interested in corrosion, metallurgy and materials failure analysis and its prevention.
This corrosion prevention method involves dipping steel into molten zinc. Energy for the world corrosion c i corrosion is defined as the chemical or electrochemical reaction between a metal and its environment resulting in the loss of the mate ial and its p ope ties material properties. Rusting of iron explanation, chemical reaction, prevention. A power point to lead students through the lesson 2. Corrosion may be broadly defined as the degradation of a material due to interaction with its environment. Appoint corrosion monitors on unit orders, as an additional duty. Webcorr has 55 corrosion courses for you to choose from for inhouse training courses, online courses and distance learning courses. Corrosion, metallurgy, failure analysis and prevention. Ppt corrosion prevention and powerpoint presentation.
Marine corrosion and its prevention in small vessels key learning objectives. Chapter 4 an introduction to corrosion and its prevention. Only iron oxide is formed when rusting takes place. Corrosion is the wearing away of metals due to chemical reactions, mainly oxidation. Mitigating pitting corrosion in the oil and gas industry. This phenomenon is a great example of the corrosion of metals, where the surfaces of metals are degraded into more chemically stable oxides. Corrosion can occur in materials like polymers and ceramics and this type is known as degradation. Zn becomes the anode, and iron becomes the cathode. Recap on fundamental corrosion principles including, driving force for electrochemical activity and principles of galvanic corrosion understand the corrosion mechanisms that undermine the performance of stainless. Rusting of automobiles, buildings and bridges, fogging of silverware, patina formation on copper.
Corrosion prevention is often more practical and achievable than its total elimination. The term corrosion is sometimes also applied to the degradation of. Corrosion damage characterized by the complete loss of operational capability of the technical system. As corrosion most often occurs in aqueous environments, we now explore the different types of degradation a metal can experience in.