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Effect of Sensitization on the Corrosion Resistance of a New and Advanced Version of Alloy N08825

Alloy UNS N08825 is a nickel-iron-chromium alloy with additions of molybdenum copper and titanium. The alloy was designed for applications in the chemical process industry as well as in oil and gas industry.UNSN08825 shows an excellent corrosion behavior in sour service environment and a high resistance to stress corrosion cracking and sulfide stress cracking. However due to its low molybdenum content of 3 wt.% alloy UNSN08825 has limited resistance to pitting and crevice corrosion in chloride containing environments.A new advanced version of UNS N08825 which will be called in this paper UNS N08825 CTP with higher molybdenum content was developed to improve its corrosion resistance. Previous corrosion tests showed an increased critical pitting temperature of the new alloy. Based on these data further corrosion tests were performed.An important factor that has a detrimental influence on the corrosion behavior is the sensitization of the material. To simulate the real life application of this alloy different heat treatments were performed especially under critical temperatures where detrimental phases occur. Pitting corrosion intergranular corrosion and susceptibility to hydrogen embrittlement were investigated within the testing program as well as stress corrosion cracking (SCC) resistance.This paper will present an overview of the corrosion behavior of this new and improved version of UNS N08825 which was called Alloy 825 CTP.

Product Number: 51319-12729-SG
Author: Julia Botinha
Publication Date: 2019
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