How do you remove corrosion from hot water pipes?
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| This suggests that this hot corrosion results from an electrochemical reaction | |
| It is found that the role of various alloying elements in alloys and coatings depends on the details of the hot corrosion mechanism. | |
313 Citations | Our studies substantiate that increasing the concentration of oxidants in water and maintaining flowing conditions can reduce the amount of iron release from corroded iron pipes. |
313 Citations | Based on our studies, it is proposed that iron is released from corroded iron pipes by dissolution of corrosion scales, and that the microstructure and composition of corrosion scales are important parameters that can influence the amount of iron released from such systems. |
41 Citations | Hence electrochemical techniques appear to be quite useful in evaluating the coatings for hot corrosion resistance. |
28 Citations | However, a quality control is needed, especially since the sulphide causes the steel pipes to be more vulnerable towards localized corrosion. |
| It is shown that hot corrosion consists of initiation or incubation and propagation stages. | |
| Corrosion can be controlled by inhibitor injection in the transportation pipeline by adding oil soluble, water dispersible, and filming amine type corrosion inhibitors that can disperse sufficiently into stratified water layers. | |
41 Citations | Based on the results, an electrochemical mechanism is proposed and shows that hot corrosion of protective coatings is an electrochemical phenomenon. |
83 Citations | Therefore, the corrosion of cast iron pipes induces only a chemical decay of chlorine corresponding to its reaction with ferrous ions released by iron dissolution and the total consumption rate is exactly obtained from the corrosion current density. |
19 Citations | Zinc coatings in galvanized pipes contribute to metal corrosion prevention, while attention should be paid to zinc release. |
| It has been found in the paper that localised corrosion is the primary form of corrosion of cast iron water pipes. | |
| The high variation of corrosion rates is controlled by the aging pipes and smaller diameter. | |
22 Citations | In cast-iron pipes, chlorine consumption due to internal corrosion is high compared with consumption caused by other water-quality factors in such systems and may be considered as an approximate indicator of the rate of internal corrosion. |
26 Citations | These results provide new evidence for the sulfidationoxidation mechanism of hot corrosion. |
| The paper concludes that long-term tests on corrosion behaviour of cast iron pipes can help develop models for corrosion-induced deterioration of the pipes for use in predicting the remaining service life of the pipes. |
Related Questions
What is hot corrosion?5 answersHot corrosion is a chemical process that occurs in metals exposed to hot gases above 400°C without a liquid water phase, leading to surface degradation and material loss. It involves the formation of non-protective scales, corrosion products, and erosion-corrosion due to entrained solid particles, impacting the integrity of the oxide film on the metal surface. Hot corrosion can be accelerated by the presence of chloride salts, causing the formation of cavities and cracks in the corrosion layers. Additionally, exposure to molten Na2SO4-NaCl salts can lead to oxidation and sulfuration mechanisms in superalloys, affecting the formation of protective films on the alloy surface. Protective coatings like Cr3C2-NiCr have shown effectiveness in reducing hot corrosion by forming stable oxide scales on steel surfaces.
What is hot corrosion?5 answersHot corrosion is a chemical process that occurs when a metal is in contact with a hot gas, typically at temperatures above 400 °C, in the absence of liquid water. It is characterized by the formation of an oxide layer on the metal surface, which is influenced by ionic diffusion and electronic conductivity within the oxide. Hot corrosion can lead to various forms of degradation, including thinning, erosion-corrosion, localized attack, and embrittlement. The main factors influencing hot corrosion are oxidation, sulfidation, temperature of exposure, and the presence of salt environments. While sulfur has been viewed as the primary cause of hot corrosion, recent research suggests that the deposit chemistry influencing hot corrosion is more complex, involving multiple sulfates and silicates. Additionally, the removal of sulfur from fuel may not completely eliminate hot corrosion, as other contaminants such as seawater salts and atmospheric contaminants can contribute to the corrosion process.
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