scholarly journals Pickling Behavior of Duplex Stainless Steel 2205 in Hydrochloric Acid Solution

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Huaying Li ◽  
Aichun Zhao
Keyword(s):  
Stainless Steel ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Duplex Stainless Steel ◽  
Oxide Scale ◽  
Hydrochloric Acid Solution ◽  
Outer Layer ◽  
Oxide Scales ◽  
2205 Duplex Stainless Steel ◽  
Pickling Process

The oxide-scale structure and pickling behavior of oxided 2205 duplex stainless steel in the electrolytes containing hydrochloric acid were investigated. The oxide scales mainly consist of two layers: the outer layer is dense Fe2O3, and the inner granular is FeCr2O4 spinel. During the pickling process, pittings form around the boundaries of FeCr2O4 particles or interfaces of two kinds of oxides, which results in that the electrolyte can directly react with the chromium-depleted layer along the pittings to produce an “undercut” effect so that the pickling efficiency is improved markedly. The pickling mechanism was discussed, and the model was established.

Electrochemical Behavior of 430 Ferritic Stainless Steel in HCl Solution at Different Temperatures

2013 ◽  
Vol 446-447 ◽  
pp. 394-397
Author(s):  
Pei Yang Shi ◽  
Xiao Liang Li ◽  
Ying Ying Yue ◽  
Cheng Jun Liu ◽  
Mao Fa Jiang
Keyword(s):  
Stainless Steel ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Hydrochloric Acid Solution ◽  
Electrochemical Behavior ◽  
Effect Of Temperature ◽  
Positive Direction ◽  
Tafel Slope ◽  
Different Temperatures ◽  
Pickling Process

The environmental concerns brought during pickling process of stainless steel in HNO3-containing acids need urgent attention. Choosing the hydrochloric acid pickling process as study object, this paper conducted a systematic study of the effect of temperature on the electrochemical behavior of stainless steel in hydrochloric acid solution. Research indicated that as temperature rose, the corrosion potential of 430SS in hydrochloric acid solution moved to positive direction with band to a narrow 0.1V. Meanwhile, the current intensity increased which indicated the acceleration of corrosion rate. In addition, the anode Tafel slope increased firstly and decreased later while the cathode Tafel slope increased slightly.

Corrosion Behavior of Austenitic Stainless Steel in Hydrochloric Acid Solution and Flow

2016 ◽  
Vol 850 ◽  
pp. 78-85 ◽  
Author(s):  
Bing Yi Liu ◽  
Ya Jun Xue ◽  
Zong Hui Yang ◽  
Xin Xian Fang
Keyword(s):  
Stainless Steel ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Hydrochloric Acid Solution ◽  
Stainless Steels ◽  
Phase Flow ◽  
Medium Temperature ◽  
Corrosion Rates ◽  
Steel Increase ◽  
Selective Corrosion

The corrosion behaviors of austenitic stainless steels, 304 and 316L as a contrast material, are investigated in hydrochloric acid corrosion under different conditions including immersion corrosion, single-phase flow and two-phase flow, respectively. The corrosion mass loss test and electrochemical test were carried out to evaluate the influence of medium temperature and concentration. The specimen surface morphologies and chemical compositions were obtained using scanning electron microscope to analyze the corrosion mechanism. The results show that the static corrosion rates of 304 and 316L steels and erosion corrosion rates of 304 steel increase obviously with the medium temperature increasing, but, the effect of hydrochloric acid concentration on their corrosion rate is less than that of the temperature. The corrosion current density values of 304 stainless steel increase and its passivation region of the polarization curve becomes narrowing and disappeared as the medium temperature increase. Uniform corrosion is the main way found on the surfaces of the stainless steels at room temperature in the hydrochloric acid solution. However, the selective corrosion occurs on their surface with the medium temperature increasing, and the higher temperature and concentration of corrosion medium, the more serious selective corrosion.

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