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07200 Results of an Investigation into the Localized Hydrogen Embrittlement of Titanium Heat Exchanger Tubes in a Wastewater Environment

Picture for 07200 Results of an Investigation into the Localized Hydrogen Embrittlement of Titanium Heat Exchang
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Product Number: 51300-07200-SG
ISBN: 07200 2007 CP
Author: Kozo Onishi, Ma Saya Yano, Takahisa Hoshika, and Takumi Haruna
Publication Date: 2007
Industry: Water/Wastewater
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Titanium heat exchanger tubes used in a wastewater environment at about 150 C for about seven years have been investigated. As can be predicted, no corrosion was observed on the inner surface of the tubes, but titanium hydrides were locally formed on the wastewater side (i.e., outer surface) of the tube. Most of titanium hydrides on the outer surface were observed on the outer surface of the tube contacted with the baffle plate and the tube sheet. Therefore, it is suggested that hydrogen generates and absorbs at the outer surface of the tubes contacted with the plate and the sheet. A hydrogen absorption test has been carried out in the laboratory by scratching a titanium tube while immersed in water or a sodium sulfate solution. It is considered that the titanium oxide film on the tube is destroyed through contact with the baffle plate, and thereby the corrosion potential of titanium decreases to the region at which hydrogen generates easily.
Titanium heat exchanger tubes used in a wastewater environment at about 150 C for about seven years have been investigated. As can be predicted, no corrosion was observed on the inner surface of the tubes, but titanium hydrides were locally formed on the wastewater side (i.e., outer surface) of the tube. Most of titanium hydrides on the outer surface were observed on the outer surface of the tube contacted with the baffle plate and the tube sheet. Therefore, it is suggested that hydrogen generates and absorbs at the outer surface of the tubes contacted with the plate and the sheet. A hydrogen absorption test has been carried out in the laboratory by scratching a titanium tube while immersed in water or a sodium sulfate solution. It is considered that the titanium oxide film on the tube is destroyed through contact with the baffle plate, and thereby the corrosion potential of titanium decreases to the region at which hydrogen generates easily.
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