1,3‐Bis‐dibutylaminopropan‐2‐ol as inhibitor for reinforcement steel in chloride‐contaminated simulated concrete pore solution

Abstract

An organic compound, 1,3‐bis‐dibutylaminopropan‐2‐ol (BDAP) was prepared and tested experimentally as inhibitor for reinforcement steel in simulated concrete pore solution. The electrochemical behavior of carbon steel electrodes immersed in simulated pore solutions with different concentration of BDAP was investigated by electrochemical measurements. Adsorption isotherm was determined based on the inhibition efficiency. The surface composition was evaluated via X‐ray photoelectron spectroscopy (XPS) as well in order to verify the presence and adsorption property of BDAP. The results showed that BDAP could effectively suppress the anodic process of carbon steel corrosion and the inhibition efficiency was improving with the increase of inhibitor concentration. BDAP could adsorb on carbon steel surface according to Langmuir adsorption isotherm. XPS spectrum certified the existence of BDAP on the steel surface.

Effect of tartrate on the electrochemical behaviour and semiconductive properties of passive film on steel in saturated calcium hydroxide

“…A shift of the pitting initiation potential of 622 mV to the positive direction obtained in the presence of 10 −3 mol dm −3 and almost twice wider passive range are direct indicator of the retarding effect of tartrate on the pitting initiation process. Knowing that the localized corrosion initiation may be viewed as the outcome of a competitive process between the inhibiting properties of hydroxide and the breakdown‐inducing effect of chloride ions, the higher E pit in the tartrate containing systems may be viewed as outcome of competitive adsorption of tartrate and chloride anions . Once adsorbed at the oxide film surface by carboxylate group tartrate may exhibit electrostatic repulsion with negatively charged carboxylate group not involved in the adsorption process, disabling negatively charged chloride ions to approach the oxide surface .…”

“…The most of the available and applied commercial inhibitors in concrete technology are inorganic compounds, such as nitrite or chromate based admixtures, which are efficient as corrosion inhibitors, but are at the same time rising issues due to their toxicity and possible increase of corrosion rate in case of low dosage . Therefore, the trend in the field of admixtures is to search for new ecologically acceptable inhibiting admixtures among prospective organic compounds, such as alkanolamines and amines and mono and polycarboxylic organic acid salts and polymers .…”

Electrochemical investigations on the performance of newly synthesized azomethine polyester on rebar corrosion

“…Many types of inhibitors namely anodic, cathodic, and migrating or penetrating corrosion inhibitors have been studied by various researchers . Based on their usage, it is divided into two groups : one is admixed inhibitors (e.g. calcium nitrite, calcium nitrate ), which is added to the fresh concrete for new structures and the second one is migrating corrosion inhibitor .…”

Inhibition Effect of Different Corrosion Inhibitors on Steel Bars Corrosion and Improvement Effect After Double Doped

“…When the mixing amount of TEA was lower than 1.5%, the electrode potential of steel bar electrode was different degree of decrease after 30 min of energizing, and steel bar existed the risk of corrosion; when the mixing amount was range from 1.5% to 2.0%, the electrode potential of steel bar electrode maintained in the passive state, it indicated that this amount of corrosion inhibitor was better effect on the corrosion of steel bar. The reason for the was that TEA contained hydroxyl, the corrosion rate of the steel bars would gradually decrease due to the activity of hydroxyl greater than that of chloride ions [24]; when its mixing content was greater than 2.5%, the electrode potential of steel bars was reduced obviously and the risk of steel bar corrosion was improved. The result showed that the mixing content of TEA at the dosage of 1.5% ~2% was good inhibition performance and the effect was not changed significantly over time.…”