|Table of Contents|

Study on surface passivation process and properties of S-130 stainless steel(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2019年03期
Page:
64-69
Research Field:
工艺与材料
Publishing date:

Info

Title:
Study on surface passivation process and properties of S-130 stainless steel
Author(s):
QUAN Linlin;  WANG Ying
(Xi'an Space Engine Company Limited, Xi'an 710100, China)
Keywords:
S-130 stainless steel;  corrosion resistance;  polarization curve;  electrochemical impedance spectroscopy;  passivation film
PACS:
TG174.4
DOI:
-
Abstract:
In order to obtain the passivation film with excellent corrosion resistance on the surface of S-130 stainless steel(cast steel), the electrochemical workstation was used to analyze the open circuit potential curve, polarization curve(Tafel)and electrochemical impedance spectroscopy(EIS)of S-130 stainless steel in different passivation solution systems, so as to obtain the growth behavior and corrosion resistance of the passivation film.The experimental results show that the passivation film of S-130 stainless steel in citric acid system grows smoothly and the film layer is dense, and there is no dissolution phenomenon of the passivation film; after the passivation by citric acid system, the charge transfer resistance(261.4 Ω)is significantly larger than that of HNO3 passivation solution system(133.8 Ω)in 3.5% standard NaCl solution test. The corrosion current is less than that of HNO3 passivation solution system in the same environment. The corrosion current decreases by 58.4%, and the corrosion rate in NaCl solution is significantly reduced.Therefore, compared with the traditional HNO3 passivation solution, S-130 stainless steel is of better passivation effect in the new environmentally friendly citric acid passivation solution, and the passivated S-130 stainless steel also shows more excellent corrosion resistance.

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Last Update: 2019-06-30