| NAN Hai-yang,LIU Hui-cong,LI Wei-ping,ZHU Li-qun,ZHANG Jian,DU Fan.Failure Analysis and Prevention of Coating on Sintered NdFeB[J],46(4):12-15 |
| Failure Analysis and Prevention of Coating on Sintered NdFeB |
| Received:December 29, 2016 Revised:April 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.04.003 |
| KeyWord:NdFeB coating phytic acid derivatives corrosion corrosion inhibition adsorption |
| Author | Institution |
| NAN Hai-yang |
Beihang University, Beijing , China |
| LIU Hui-cong |
Beihang University, Beijing , China |
| LI Wei-ping |
Beihang University, Beijing , China |
| ZHU Li-qun |
Beihang University, Beijing , China |
| ZHANG Jian |
Jingci Material Science Co., Ltd, Beijing , China |
| DU Fan |
Jingci Material Science Co., Ltd, Beijing , China |
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| Abstract: |
| The work aims to study failure of coating on sintered NdFeB. Aided by SEM and electrochemical test methods including polarization curves, AC impedance and zero charge potential, main reason was testified to be NdFeB corrosion inside the coating, which reduced the coating adhesion. Phytic acid derivatives could efficiently inhibit corrosion inside the coating. The was 27.93 kJ/mol. The was mainly physical adsorption and partly chemical adsorption. The corrosion inhibition mechanism is the adsorption of phytic acid derivatives on NdFeB, which prevents the occurrence of corrosion. |
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