Leakage Causes of Nickel Tube Used in Caustic Soda Falling Film Evaporator

ZHANG Tengzhong; LI Yongyou; ZHANG Qi; LIU Haiding; WANG Dongzhe; ZHANG Jian

doi:10.11973/fsyfh220623

Corrosion & Protection > 2025 > 46(2): 116-121. > DOI: 10.11973/fsyfh220623

ZHANG Tengzhong, LI Yongyou, ZHANG Qi, LIU Haiding, WANG Dongzhe, ZHANG Jian. Leakage Causes of Nickel Tube Used in Caustic Soda Falling Film Evaporator[J]. Corrosion & Protection, 2025, 46(2): 116-121. DOI: 10.11973/fsyfh220623

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Leakage Causes of Nickel Tube Used in Caustic Soda Falling Film Evaporator

ZHANG Tengzhong^{1, 2, 3, ,},
LI Yongyou^{1, 2, 3},
ZHANG Qi^{1, 2},
LIU Haiding^{1, 2, 3},
WANG Dongzhe^{1, 2, 3},
ZHANG Jian⁴

1.
Chongqing Materials Research Institute Co., Ltd., Chongqing 400707, China
2.
National Instrument Functional Materials Engineering Technology Research Center, Chongqing 400707, China
3.
Chongqing Key Laboratory of Corrosion-Resistant Alloys, Chongqing 400707, China
4.
Chongqing Bozhang Mechanical & Electrical Equipment Co., Ltd., Chongqing 400030, China

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Received Date: October 25, 2022

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Abstract

The causes of leakage of falling film nickel tubes of caustic soda evaporator in a chemical plant were studied by means of optical microscope, scanning electron microscope and electron probe. The results showed that the main causes of leakage were chemical corrosion caused by oxygen from the decomposition of NaClO₃ impurity in the raw lye, and erosion and wear caused by uneven distribution of lye liquid film.
- caustic soda,
- falling film evaporator,
- nickel tube,
- corrosion failure

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