Abstract
It is not feasible to use tungstate alone as a corrosion inhibitor in industrial cooling water systems due to its low oxidizing ability and high cost. The objective of this paper is to develop efficient synergistic inhibitor combinations that include very low concentrations of tungstate, keeping in a view their application in industrial cooling water system. The other inhibitor selected for this work is sodium phosphate, one of the cost-effective conventional inhibitors. Even though all the synergistic combinations studied in the present work showed high inhibition efficiency, a 4:1 ratio of sodium phosphate and sodium tungstate of total 1000ppm (800ppm SP + 200ppm ST) was found to be the optimum. The effect of temperature and depletion of the inhibitor solution were also studied. The metal oxide layer incorporated with tungstate and phosphate was found to cause effective passivation.
| Original language | English |
|---|---|
| Pages | 117-122 |
| Number of pages | 6 |
| Volume | 49 |
| No | 3 |
| Specialist publication | Corrosion Prevention and Control |
| State | Published - Sep 2002 |
| Externally published | Yes |
ASJC Scopus subject areas
- Metals and Alloys