Behavior of Phosphate Inhibitor on Pitting Corrosion Resistance of Cr-Mo Steel

International Conference on Science and Innovated Engineering

工业技术（总论）;自然科学（总论）

Hastuty, Sri^1 ; Awwaluddin, Muhammad^2

Department of Mechanical Engineering, Universitas Pertamina, Jakarta

12220, Indonesia^1

Center for Nuclear Facility Engineering, National Nuclear Energy Agency of Indonesia, Jakarta

12710, Indonesia^2

关键词: Concentration variation;    Corrosion tendency;    Cyclic polarization;    Destructive process;    Disodium phosphate;    Optimum concentration;    Pitting resistance;    Trisodium phosphate;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/536/1/012025/pdf
DOI  :  10.1088/1757-899X/536/1/012025

来源: IOP

【 摘 要 】

Trisodium phosphate (TSP) and disodium phosphate (DSP) inhibitors are widely used in industrial area, for example in boiler and condenser system. Their primary uses as scaling inhibitor through anodic and cathodic reaction. Therefore, concentration of TSP and DSP is a dominant factor to intended service; it could be advantage if the concentration is proportional, or on the contrary, destructive if the concentration is not proportional because it will drive localized corrosion on tube boiler made from Cr-Mo steel. In this research, type of localized corrosion will be focused on pitting corrosion. To gain maximum protection effect of TSP and DSP inhibitors, which is also for controlling corrosion as destructive process, optimum concentration of inhibitor was determined. To investigate the effect of concentration variation of TSP and DSP on pitting resistance Cr-Mo steel and optimum concentration of TSP and DSP as inhibitor, pitting corrosion tendency by using cyclic polarization was measured. The result was TSP and DSP retarded pitting corrosion by adsorbed on Cr-Mo steel surface. It was also found that inhibitor optimum concentration range is between 20.000 ppm TSP + 1.000 ppm DSP. 100.000 ppm TSP + 1.000 ppm DSP (10%V), which pH optimum range is between 11 to 12.