How Does Sodium Tungstate Delay Metal Corrosion
Corrosion inhibitor is a kind of substance which can prevent or retard the corrosion of metal in environmental medium under low concentration.
It can be divided into three kinds: inorganic inhibitor, organic inhibitor and polymer inhibitor. Commonly used cooling water corrosion inhibitors are chromate, nitrite, phosphate and so on, but they all have one characteristic, that is, toxic. With the enhancement of human's environmental protection consciousness, the development and application of low toxic or nontoxic inhibitors have been paid attention to.
Sodium tungstate is one of inorganic inhibitors. It is used as a metal corrosion inhibitor because of its low toxicity, no harm to environment, human body and crops, and no microorganism breeding. Using sodium tungstate as a metal is a corrosion inhibitor, not only effective, but also green.
Some scholars used sodium tungstate inhibitor to test the corrosion inhibition of sea water on carbon steel, in the experiment, sodium tungstate and sodium lauroyl sarcosine (SLS) were used to draw the conclusion under suitable concentration, the composite corrosion inhibitor of sodium tungstate has a good corrosion inhibition effect on seawater Q235 carbon steel, and the corrosion inhibition efficiency increases with the increase of its concentration. The adsorption of sodium tungstate on carbon steel is a mixture of physical adsorption and chemical adsorption, capable of being adsorbed on a clean metal surface to form a monolayer, to prevent water and dissolved oxygen diffusing to the metal surface, the inhibition efficiency is more than 95%. The corrosion rate was reduced to below 0.075 mm/a, and the effect was satisfactory.
By the test results, we can envision sodium tungstate has very broad application prospects in terms of delaying the metal corrosion, such as oil pipeline, corrosive environment water supply pipeline, bridge foundation, electroplating equipment, electroplating factory, as well as the use of a large number of sand of the coastal city of the real estate industry in building. Sea sand will also corrode steel, if in the concrete synthesis process, adding appropriate sodium tungstate complex type corrosion inhibitor can also extend the life of the building, and of course, this takes a long time to see the results.
If you have any inquiry of tungsten, please feel free to contact us:
Tel.: +86 592 5129696/+86 592 5129595
Fax: +86 592 5129797
Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.
评论
发表评论