Acid tank trailer is used for transportation of sulfuric acid, hydrochloric acid, hydrofluoric acid, nitric acid, acetic acid and other different kinds of acid.

Because a lot of chemical liquids are highly corrosive and easy to react with metals,so when buying chemical liquid transport vehicle, you need to choose according to the liquid you want to transport. The most common type on the market today is the tank trailer truck that carries concentrated sulfuric acid, which is the focus of our discussion in this article.

Why can't acid tank trailers be corroded?

Concentrated sulfuric acid is highly oxidizing, acidic, and corrosive, so it cannot be transported in ordinary tanks. But the active metal ferric aluminum passivates with cold concentrated sulfuric acid and nitric acid, because the surface of the aluminum and iron is oxidized to form a dense oxide film, so that the acid will not enter the interior to continue the reaction. So stainless steel is used mostly to transport concentrated sulfuric acid.

acid tanker for sale

Sulfuric acid tank is a tank for storing sulfuric acid in chemical industry. At present, the sulfuric acid tank for storing sulfuric acid (more than 90%) in domestic market or enterprises is made of carbon steel. Concentrated sulfuric acid has strong oxidation, and will be passivated with aluminum, iron and other metals, to form a dense passivation film on the metal surface (metal oxide film), have the effect of isolated reactants, protective film in the pure metal elemental, It no longer reacts with strong oxidizing acids outside the membrane, so the steel tank that stores concentrated sulfuric acid will form a dense oxide film where it comes into contact with concentrated sulfuric acid and will not be corroded.

What causes the corrosion of liquid chemical tank trailers transporting sulfuric acid？

Corrosion has always been a problem in chemical liquid tank trailers, especially in tanks transporting 99+ % sulfuric acid and wasted alkylation sulfuric acid. Corrosion occurs when sulfuric acid produces hydrogen. As the gas moves upward in the tank, it corrodes the steel surface and forms a grooved corrosion. The tank body without any lining protection, hydrogen will cause severe grooved corrosion rather than uniform corrosion. It is this grooving corrosion that makes many acid tanker trailers problematic and even unusable.

In the upper horizontal position of the tank, when the surface of the tank comes into contact with H2SO4, hydrogen grooves will occur. The actual corrosion of carbon steel in sulfuric acid will produce hydrogen molecules, and hydrogen bubbles formed by hydrogen molecules will cause corrosion. The rise of the hydrogen bubbles creates turbulence, exposing the metal to the acid. The damage to the film is not uniform, but is exposed parallel to each other along a more biased path.

Waste sulfuric acid contains high concentration of water, impurities or dissolved gases, which will accelerate metal corrosion. Sometimes chemical acid liquid tank cleaning process can also lead to corrosion problems.

Acid tanker trailer

How to solve the corrosion problem of chemical liquid tank truck transporting sulfuric acid?

Anti-corrosive coating has good application effect in solving the corrosion problem of chemical liquid tank trailers transporting sulfuric acid. Its advantages are as follows:

1. Made with unique polymer technology, it has good corrosion resistance and can protect against many kinds of corrosive chemicals, including strong acids, strong alkalies, gases, solvents and oxidants.

2. Maximum delivery of various clean petroleum products (CPPs), palm oil fatty acid distillates (PFADs), biofuels, methanol, etc.

3. The nearly impermeable film coating minimizes absorption and ensures purity of the cargo.

4. Excellent adhesion and adhesion to metal substrate, composite material and concrete.

5. The coating surface smoothness is more than 40 times that of stainless steel.

6. Very low volatile organic compounds.

Sulphuric acid tanker trailer

Leakage forms of concentrated sulfuric acid tank trailers are easy to appear

1. Weld leakage: it is characterized by the occurrence of pitting pits on the surface of the weld, which are continuously distributed and widened from the inside to the outside, finally forming weld perforation. The main reason for the formation is that the weld stress concentration, and the inclusion of bubbles, slag and other defects, this will produce electrochemical corrosion, resulting in perforation.

2. Tank bottom leakage: this situation is generally common in the sealing head position,it is caused by residual sulfuric acid corrosion, general insufficient transport, or not cleaned in time residual concentrated sulfuric acid long-term contact with air will likely cause such a situation, especially with liquid contact parts of the fastest corrosion.

3. Corrosion and leakage of the base material of the tank: it is generally caused by the fatigue corrosion of the tank, mainly by the inevitable corrosion of the medium and the improper inspection of the acid tanker trailer.

carbon steel acid tanker trailer

Based on the analysis of the corrosion problem of concentrated sulfuric acid tank trailer and looking for appropriate measures to protect the equipment, CMI heavy anti-corrosive material can be used to protect the equipment. CMI material coating is a two-component thermosetting polymer coating with high official energy. The product is different from other coatings in its highly dense cross-linking structure when cured. The product performance and corrosion resistance has been significantly improved. Compared with other materials, it has stronger corrosion resistance, toughness, wear resistance, heat resistance and chemical penetration resistance.

The heavy-duty anti-corrosive material has shown a series of excellent properties in its past use. The material has been subjected to extreme stress and chemical corrosion and abrasion for more than 10 years. The coating has been applied successfully in the toughest working conditions around the world, from the most corrosive cargo to hot pipeline corrosion at sub-freezing temperatures.

How to deal with corrosion leakage of sulfuric acid tank trailer?

Sulfuric acid is a kind of active binary inorganic strong acid, can react with most metals. But sulfuric acid is also an important industrial raw material.In the storage and protection of sulfuric acid, there are strict requirements. But at present, the supply and transportation of sulfuric acid is basically carried out by sulfuric acid tank trailer truck, and there are more stringent requirements for it.

Corrosion Resistance Tank Body Construction

It is of great significance to ensure the safety of the acid tanker trailer to strengthen the inspection of the sulfuric acid tank trailer truck in daily life, find out the hidden danger in time and take appropriate measures to repair it, so as to avoid the occurrence of tank leakage accident.

Normally, concentrated sulfuric acid will react with the tank to form a dense inert metal oxide film, preventing further acid and metal reaction, so under normal conditions,concentrated sulfuric acid will not cause serious corrosion of the tank. But in the actual situation, it is inevitable to repeatedly fill, empty operation, tank cleaning, welding quality and other reasons, will cause different degrees of corrosion of the acid tanker trailer, serious ones can lead to leakage.

In addition to anti-corrosion protection, daily tank inspection and protection should also be done well

1. Timely inventory tank, found there is no corrosion phenomenon, to timely carry out a special inspection.

2. When washing, enter the tank for inspection at the same time, and take the method of heat preservation sleeve and water to check whether the tank leaks.

3. When the corrosion of equipment exceeds the limit, special maintenance process should be developed, and CMI heavy anti-corrosion materials should be used to repair in time. After the repair, the equipment can continue to be used after acceptance.

chemical liquid tank trailers

The above is about the general problem of the acid tank trailer need to pay attention to, which is helpful for you to buy acid tank trailer. As for the configuration and structure of the acid tank trailers, you need to consult SUNSKY sales manager.Or send an inquiry to leave your message,SUNSKY sales manager will contact you soon.