SU366226A1 - FOUNDATION ^^ «APERSH - Google Patents

Description

METHOD OF PROTECTING METALS AGAINST ACID CORROSION

one

This invention relates to the protection of metals against acid corrosion.

There is a method of protecting metals, in particular steel from acid corrosion using inhibitors, which can be used as derivatives of a triazole, for example, 1,2,3-benzotriazole. The protective effect of the latter is achieved at a concentration of 10–20 mmol / l in 0.1 N sulfuric, hydrochloric, azogenic, and phosphoric acids.

In order to expand the range of effective inhibitors, 1,4-di: phenyl (3,5-endanyl) -dihydro-1,2,4-triazole (nitron) is used as an inhibitor. The latter can be applied in a mixture with potassium iodide. 1,4-diphenyl (3,5-e "daiyl) -ditidro1, 2,4-triazole with the chemical formula

Sbn

This inhibitor was studied in solutions of hydrochloric (1, 3, 5, and 7 n. Of concentration) and seric acids (8 n. Of concentration). The study was conducted on the cleaned steel samples-10

50X20x2 mm in size, processed according to the generally accepted method. The composition of steel. %: C0,07

MP0.035

Si0.02

S0.027

Cr 0.15

Ni0.13

Р0,02

The optimal inhibitor concentration is 0.5%. The investigated additive is more effective in hydrochloric acid solutions than sulfuric. Data on the protective action are shown in Tables 1 and 2.

Table 1 (- 12 ms t 18-С)

table 2

The effect of temperature on the corrosion rate and the inhibitory effect of steel-10 in 7 n. HCI in the presence of

inhibitor

The corrosion rate is p in e / m h, the inhibitory effect / (p / p, where p / p is the metal dissolution rate, respectively, in the uninhibited and inhibited acids).

As the temperature rises to 40 ° C, the inhibitor effect of the inhibitor increases, then decreases somewhat (Table 2). With the addition of KI, the protective properties of the proposed Inhibitor Subject and Problem Oi And 1. A method for protecting metals from acid corrosion by using a triazole derivative inhibitor, different in that in order to extend the assortment; en.ta effective inhibitors, as a prod-

torus increases in solutions of hydrochloric and sulfuric acids on steel 10 and nickel (Table 3).

Table 3 aqueous triazole used 1,4-diphenyl (3,5-endanyl) -dihydro-1, | 2,4-triazole. 2. Method 1 of claim 1, characterized in that 1,4-d, ifenyl (3,5-endanyl) -dihydro-1,2,4-triazole is used in a mixture with potassium iodide.