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51316-7680-Materials Selection for Use in Hydrochloric Acid

Product Number: 51316-7680-SG
ISBN: 7680 2016 CP
Author: Ajit Mishra
Publication Date: 2016
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Hydrochloric acid (HCl) is an important mineral acid with many uses including the pickling of steel acid treatment of oil wells and chemical cleaning and processing. This acid is extremely corrosive and its aggressiveness can change drastically depending on its concentration the temperature and contamination by oxidizing impurities. One of the most commonly encountered oxidizing impurities is the ferric ion. In general stainless steels and copper alloys cannot tolerate aggressive HCl solutions hence the need to use corrosion-resistant nickel-based alloys.A part of this study focused on the role of alloying elements on the corrosion performance of commercial nickel-based alloys (C-4 (UNS N06455) C-276 (UNS N10276) C-22 (UNS N06022) C-22HS (UNS N07022) C-2000 (UNS N06200) Hybrid-BC1 (UNS N10362) and B-3 (UNS N10675)) in the HCl solutions with and without the presence of oxidizing impurities. Aggressive HCl solutions can also be used to simulate the critical crevice solution. Therefore another aspect of this research is to investigate the localized corrosion performance of these corrosion-resistant nickel-based alloys in chloride solutions in a crevice set-up and to evaluate the role of alloying elements in crevice corrosion inhibition. In the present study various standard corrosion test methodologies conservative electrochemical techniques and a range of surface analytical tools have been utilized.
Hydrochloric acid (HCl) is an important mineral acid with many uses including the pickling of steel acid treatment of oil wells and chemical cleaning and processing. This acid is extremely corrosive and its aggressiveness can change drastically depending on its concentration the temperature and contamination by oxidizing impurities. One of the most commonly encountered oxidizing impurities is the ferric ion. In general stainless steels and copper alloys cannot tolerate aggressive HCl solutions hence the need to use corrosion-resistant nickel-based alloys.A part of this study focused on the role of alloying elements on the corrosion performance of commercial nickel-based alloys (C-4 (UNS N06455) C-276 (UNS N10276) C-22 (UNS N06022) C-22HS (UNS N07022) C-2000 (UNS N06200) Hybrid-BC1 (UNS N10362) and B-3 (UNS N10675)) in the HCl solutions with and without the presence of oxidizing impurities. Aggressive HCl solutions can also be used to simulate the critical crevice solution. Therefore another aspect of this research is to investigate the localized corrosion performance of these corrosion-resistant nickel-based alloys in chloride solutions in a crevice set-up and to evaluate the role of alloying elements in crevice corrosion inhibition. In the present study various standard corrosion test methodologies conservative electrochemical techniques and a range of surface analytical tools have been utilized.
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