corrosioninpiping-210425063500.pptxcorrosioninpiping-210425063500.pptx

corrosioninpiping-210425063500.pptx

1. Corrosion In Piping Created by : Achmad Iqbal Fathoni (2712100054) Hendri F Purba (27121000 Kamil Akbar (2712100

2. corrosion?? it’s an electrochemical process or natural reaction that goes by itself, it can’t be controlled or slowed its speed is so slow the damaging process.

3. definition degradation of the metal due to the redox reaction of a metal with a variety of substances in the environment that produce compounds that are not wished.

4. Many materials like iron, steel, polymers, ceramic are damaged due to some natural process. Corrosion is one of them

5. corrosion of metals it’s the main cause of metal destruction, like steel rusts due to immersion in seawater. Similarly iron reacts with oxygen to form rust by exposure to moist air.

6. corrosion of metals Iron rust is iron oxide Fe 2 O 3 .XH 2 O where X is the amount of complexed water with ferric oxide, which can vary. It shows the color of rust (black to yellow to orange).

7. metal corrosion process In the anodic area (surface area in contact with water) occurs dissolving iron atoms with the release of electrons to form Fe2 + ions are soluble in water. Fe(s) ⎯⎯> Fe 2+ ( aq ) + 2e Ejected electrons flow through the metal, electrons flow through the external circuit on voltaic cells towards the cathodic region until there is reduction of oxygen gas from the air: O 2 (g) + 2H 2 O (g) + 2e→ 4OH - ( aq )

8. metal corrosion process Fe 2+ ions are dissolved in water droplets move towards the cathodic region, as the ions pass through the salt bridge in a voltaic cell and reacts with OH - ions to form Fe(OH) 2 . Fe(OH) 2 formed oxidized by oxygen to form rust. Fe 2+ ( aq ) + 4OH - ( aq ) → Fe(OH) 2 (s) 2Fe(OH) 2 (s) + O 2 (g) → Fe 2 O 3 .xH 2 O(s)

9. corrosion in piping Corrosion is a major factor that could potentially cause damage to gas pipes, especially pipes are in a corrosive environment and carrying corrosive material.

10. what are the factors that cause corrosion of pipes??

11. Internal Factor Internal corrosion of pipelines affected by the material supplied in the form of natural gas. There are several variables that affect the Corrosiveness natural gas, including CO 2 content and also content of H 2 S in natural gas. External Factor External corrosion of the pipe material are influenced by environmental factor outside gas pipe.

12. type of corrosion in piping??

13. uniform corrosion corrosion that occurs on the metal surface in the form of erosion of the metal surface evenly so that the thickness of the metal is reduced as a result of surface rust converted by products that typically occurs in open equipment. for example, the outer surface of the pipe.

14. pitting corrosion corrosion-shaped pits on the metal surface due to the destruction of the protective metal films caused by the corrosion rate is different from one place to another place on the metal surface.

15. stress corrosion cracking corrosion-shaped cracks that are not easily seen, is formed on the surface of metal-trying to creep into. This is common in many metals under pressure. This is due to a combination of tensile stress and a corrosive environment that weaken the metal structure.

16. erosion corrosion corrosion that occurs due to the prevention of the formation of protective film caused by the high velocity fluid flow, such as sand abrasion

17. galvanic corrosion corrosion that occurs because there is a relationship between the two metals to be joined, and there is a potential difference between the two.

18. crevice corrosion corrosion that occurs on the sidelines of gaskets, overlapping connections, screws formed by sediment or impurities arising from corrosion products.

19. selective corrosion This corrosion associated with removing one element of the alloy. The easiest example is desinfication the release of zinc from copper alloy.

20. impact of corrosion??

21. The impact of corrosion was incredible. Based on experience in previous years, the United States allocated corrosion control costs by 80 to 126 billion dollars per year. In Indonesia, only twenty years ago, caused costs due to corrosion in the field of industry-reach 5 trillion

22. The impact of corrosion can be either direct losses and indirect losses. Direct losses are in the form of damage to the equipment, machinery or building structure. While indirect losses such as the cessation of production activities due to the replacement of equipment damaged by corrosion, the loss of the product due to damage to the containers, fuel tanks or water piping network or crude oil.

23. The impact that can occur as a result of corrosion in the pipeline natural gas is a fire due to leakage of gas pipeline, as has happened in Minnesota, United States due to selective corrosion in natural gas distribution pipelines.

24. prevention of corrosion on the pipe

25. Cathodic Protection To prevent or slow down the corrosion process , then installed an artificial anode outside the metal to be protected . Regional anode is a metal part that loses electrons . Positive ions leave the metal and into the solution so that no metal is rusty . Seen here because of potential differences in the flow of electrons will flow from the anode are mounted and will hold against the flow of electrons from the metal nearby, so that the metal is turned into a cathode area . This is called cathodic protection . In the above case the electron is supplied to the anode metal is protected by an artificial so that electrons are lost from the anode region has always changed , so it will reduce the corrosion of the protected metal . Artificial anodes were planted in a common electrolyte ( in this case the soil moist ) with metal ( in this case a pipe ) to be protected and the pipes are connected with the appropriate cables to allow the electricity between the anode and the pipe continuously. So anode is sacrificed to protect the cathode . For cathodic protection on underground pipeline system commonly used metallic Mg . Pipe ( iron ) will safely protected submersible protector is still there .

26. This is often done with a metal coating ( coating ) with a metallic material that is protected from corrosion . The use of chemicals ( chemical inhibitors ) To slow down the corrosion reaction used a chemical called corrosion inhibitor that works by forming a layer on the surface of the metal pelinsung . The first layer of molecules that have formed a very strong bond called chemis option . Corrosion inhibitors are generally shaped fluid or fluid injected into the production line . Because these inhibitors is an important issue in dealing with the selection of corrosion inhibitors should be conducted in accordance with the condition . Inhibitors are substances which, when added to an environment in small quantities , according to continuous or periodic , may decrease the rate of corrosion of metals . Use of Corrosion Inhibitor is an effort to prevent corrosion . There are various types of inhibitors are known , and are classified based on the basic material , the reaction is inhibited , and the inhibitory mechanism :

27. laws of thermodynamics describe the high-energy state will change to a lower energy. This tendency makes metals rejoin the elements that exist in the environment, which eventually formed the so-called symptoms of corrosion free energy is the only factor that determines a corrosion takes place spontaneously or not. each free energy of an element is expressed as G and the energy change is expressed as AG High to low transition energy, which states that the energy supplied by the negative sign and the energy absorbed by the system with a positive sign. So in order for a reaction to take place spontaneously the AG must be negative. All Corrosion depends on the temperature, because the free energy level elements involved depends on the temperature.

28. we can apply to the following thermodynamic equation J defined for a reaction A+B  C+D If the system reaches a point where there is no change in free energy, then the system is in equilibrium and 0394G = 0

29. Journey of Life: It is a matter of “Acceptance” and “Rejection”. It is a matter of “Obedience and Rebellion”. How?