Method for measuring corrosion performance of descaling agent

Abstract

The invention provides a method for measuring corrosion performance of a descaling agent. The method comprises the steps of (a) preparing an acid descaling agent solution and a corrosion inhibitor solution; (b) wiping a test block and putting the test block into a container to degrease and dewater; taking the test block out to dry, then measuring size and weight; (c) adding the acid descaling agent solution and the corrosion inhibitor solution into a glass bottle; (d) putting the glass bottle into a constant-temperature water bath, and taking the test block out to observe, wash and dry; (e) putting the test block into a container to further degrease and dewater; taking the test block out, washing residual acid away, immersing the test block into a sodium hydroxide solution, washing and putting the test block into absolute ethyl alcohol to wash and dewater for two times; taking the test block out to dry, then wrapping up the test block by using filter paper to store in a dryer for 1 hour and then weigh with precision of 0.1mg; (f) calculating a corrosion rate of an anti-scaling agent. The method is capable of quickly testing the corrosion performance of the descalling agent; meanwhile, the method is accurate in testing result and simple in testing steps; through the method, the testing cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for measuring the corrosion performance of a descaling agent. Background technique [0002] Anti-scaling agent is a chemical preparation that removes scale, dirt and other stains, and is generally composed of multiple components. Industrial anti-fouling agents are mainly used to remove dirt in heat exchange equipment, boilers, etc. [0003] Common types and characteristics of anti-fouling agent: [0004] (1) Inorganic polyphosphate. This type is the earliest anti-fouling agent used, and its use has been restricted abroad. There are one or more repeated P-O-P bonds in its molecule, which can be divided into chain polyphosphate and cyclic polyphosphate. The disadvantage of inorganic polyphosphate is that it is easy to be hydrolyzed by moisture to form orthophosphate, especially at high temperature and high pH value, and it will react with divalent cations such as Ca2+, Mg2+, etc. to scale. [0005] (2) Organic phosp...

AI Technical Summary

Problems solved by technology

The anti-scaling effect and operating temperature of organic phosphonic acids are better than those of inorganic phosphates and organic phosphates, and are widely used, but phosphorus compounds will have adverse effects on the ecological environment (such as the so-called overfertilization effect)

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