Exploration on the corrosion cause of MTO steam heat exchange tube
MA Wen-hui1�� ZHAO Ji-qing2�� YANG Gang2�� CHEN Bin1
1. China Shenhua Baotou Charcoal Chemical Industry Co.�� Ltd.�� Shenhua Group�� Baotou 014010�� China 2. Central Iron and Steel Research Institute�� China Iron and Steel Research Institute Group�� Beijing 100081�� China
Abstract��A study was conducted on the reason behind the corrosion of MTO steam heat exchange tube by observing the corrosion morphology and analyzing corrosion product.Results showed that was caused by electrochemical corrosion of water��oxygen and sulfur in acidic methanol�� in addition to uniform corrosion accompanied by severe pitting corrosion. The lower bundle of steam heat exchange tube was below the liquid surface�� with relatively stable medium and less corrosion while the upper bundle was in the gaseous phase�� with complex medium�� dew point easily produced and more corrosion. Pitting corrosion originates from non-metallic inclusion and cementite and Cl�� in the medium accelerates its production and growth.
���Ļԣ� �Լ��� �� �� �� �� �� ��. MTOװ���������ȹܸ�ʴԭ��̽��[J]. �й������ڿ���, 2015, 33(6): 39-44.
MA Wen-hui�� ZHAO Ji-qing�� YANG Gang�� CHEN Bin. Exploration on the corrosion cause of MTO steam heat exchange tube. Chinese Journal of Iron and Steel, 2015, 33(6): 39-44.
2015, Vol. 33 
