Corrosion Audit :: essays papers

Corrosion Audit1.Introduction Corrosion is the electrochemical declension of a metal because of its chemical reaction with the surrounding env conjurement. While bleak and better materials are continuously being substantial, this progress is offset, in part, by a more aggressive operational environment. This problem is compounded by the fact that corroding is a complex phenomenon. It can take legion(predicate) different forms and the resistance of materials to corrosion can drastically change with that a small environmental change. Corrosion is most often conception of as a slow process of material deterioration, taking level over a significant period of time (examples being ordinary corrosion, pitting, exfoliation, etc.). Other forms of corrosion degradation can occur very quickly, in days or even hours, with catastrophic results. These forms (such as stress corrosion cracking, environmental embrittlement, and corrosion fatigue) depend on both the chemical and auto matonlike aspects of the environment and can cause catastrophic structural failure without warning. almost of the data of losses due to corrosion follows. In the United commonwealth the Paint Research Association has estimated that metallic corrosion costs developed countries some up to 4 per cent of gross national harvest (GNP) annually. In the UK this would equal about 30 billion. In the United States, unhomogeneous reports put the cost of corrosion slightly higher at four to five per cent, equating in that country to about US $ three hundred billion, of which it is claimed that around one-third could be prevented. In India approximately 5% of the gross domestic product is lost due to corrosion, of which again it is claimed that around one-third could be prevented. erosion AUDIT There is no clear definition of corrosion audit. It in the main contains inspecting the corrosion sites, analyzing the reasons of corrosion, suggesting methods of prevention, doing the cost ana lysis of prevention and losses due to corrosion.2.Main Materials utilise in IITK Centrifugally cast iron (CI) Galvanized iron (GI) Steel Stainless nerve Cast iron PVC (Poly venyl chloride) RCC (Reinforced concrete council) Centrifugally cast iron vs. Galvanized iron CI is more resistant to corrosion in soil and pissing environment as compared to GI. But CI cannot be threaded some(prenominal) frequently, as it will corrode very fast near the locomote and thus will lead to breakage and leakage. So CI is apply only, where long pipes are needed. For small length pipes, like those in houses, GI is the better option.