Caustic corrosion cracking of the octene tube in the fertilizer industry

被引：3

作者：

Liu, Menghao ^{[1
]}

Zhang, Ziyang ^{[1
]}

Chai, Peilin ^{[1
]}

Guo, Chuang ^{[1
]}

Du, Cuiwei ^{[1
]}

Liu, Zhiyong ^{[1
]}

Sun, Meihui ^{[1
]}

Fan, Endian ^{[1
]}

Shang, Xueliang ^{[1
]}

Li, Xiaogang ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 10083, Peoples R China

来源：

ENGINEERING FAILURE ANALYSIS | 2022年 / 133卷

关键词：

Caustic corrosion cracking; Carbon steel; Octene tube; DUPLEX STAINLESS-STEEL; HIGH-STRENGTH STEEL; SODIUM-HYDROXIDE; ROTOR STEELS; CARBON-STEEL; FILM; SUSCEPTIBILITY; MECHANISM; SURFACES;

D O I：

10.1016/j.engfailanal.2021.105953

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

A carbon steel octene tube has leaked from the fusion zone and caused economic losses. The failure process and mechanism were investigated in this work, by means of scanning electron microscope, electron backscattered diffraction, energy-dispersive X-ray spectroscopy and Scanning Kelvin probe force microscopy. Results showed the failure was attributed to caustic corrosion cracking. The cracking mechanism is anodic dissolution mechanism, including film rupture, intergranular corrosion and repassivation processes. A less corrosion-resistant chemical composition, a larger residual stress after welding and a higher content of hydroxyl ions synthetically resulted in the cracking synthetically. Hydroxyl ions firstly reacted with passive film and caused initiation of intergranular cracks. Residual stress and intergranular corrosion result in an inter granular propagation of SCC cracks.

引用

页数：12

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