Corrosion inhibition of a mild steel by aniline and alkylamines in acidic solutions

Journal Article · Tue Sep 01 04:00:00 EDT 1998 · Corrosion

DOI:https://doi.org/10.5006/1.3284891· OSTI ID:669785

Luo, H; Han, K N ^[1]; Guan, Y C ^[2]

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1. South Dakota School of Mines and Technology, Rapid City, SD (United States). Dept. of Metallurgical Engineering
2. Bateman Engineering, Inc., Denver, CO (United States)

Corrosion inhibition of a mild steel in acid solutions by alkylamines (ALK-AM) and aniline hydrochloric (ANL-HCl) salts was investigated in the presence of sodium sulfate (Na{sub 2}SO{sub 4}) and sodium chloride (NaCl) using a potentiostat, a contact-angle goniometer, a scanning electron microscope (SEM), a Fourier transform infrared spectrometer (FTIR), and an atomic force microscope (AFM). Results showed chloride ions (Cl{sup {minus}}) had a pronounced effect on inhibition of amines and ANL for corrosion of mild steel. In the presence of Cl{sup {minus}} ions, cationic types of surfactants (ALK-AM and ANL) were attached to the surface through formation of chloride precipitate at the surface. In the absence of the organic inhibitors, corrosion initiated along grain boundaries of ferrite and pearlite structures. In the presence of the organic inhibitor, however, the steel surface was covered by an organic salt precipitation, and the corrosion rate was reduced significantly.

• Sponsoring Organization: USDOE
• OSTI ID: 669785
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 9 Vol. 54; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMINES
ANILINE
CORROSION PROTECTION
HYDROCHLORIC ACID
PRECIPITATION
SODIUM CHLORIDES
SODIUM SULFATES
STEELS
SULFURIC ACID