Does polyaluminium chloride corrode pipes and equipment

2022-06-06

Does the use of polyaluminium chloride (also known as PAC, polyaluminium chloride, polyaluminium chloride) (aluminum trichloride) corrode pipes and equipment (explanation: means corrosion, disappearance, erosion, etc.)? As we all know, polyaluminium chloride is synthesized from hydrochloric acid (HCl) and bauxite (explanation: several parts are synthesized into one whole), and hydrochloric acid is very corrosive. Is its product, polyaluminium chloride, also highly corrosive and causes corrosion damage to water pipelines and other equipment?

Now let us elaborate on these cases:

1. As far as the product itself is concerned, the hydrochloric acid in the production process is mainly used in the reaction to neutralize the aluminum ash, and the obtained polyaluminum chloride (aluminum trichloride) (also known as PAC, polymerized aluminum, polyaluminum chloride) although the product has a certain degree of acidity, its acidity is already very weak, which is why we say it cannot be eaten and cannot touch the eyes, but its acidity is far from being able to corrode (explanation: refers to decay, disappearance, erosion, etc.) pipes and equipment;

2. As far as water pipelines are concerned, some corrosion-resistant materials are added to the current production of water pipelines, mainly to cope with the stability of the pipelines under certain chemical liquids and high sulfuration conditions (explanation: stable and steady; no change). Polyaluminium chloride is a new type of water purification material, inorganic polymeric flocculant, referred to as polymeric aluminium, or polyaluminium chloride, is a water-soluble inorganic polymer between AlCl3 and Al(OH)3. The general chemical formula is [Al2(OH)ncl6 NLM], where M denotes the degree of polymerization and N denotes the neutrality of PAC products. Polyaluminium chloride has a Keggin structure of highly charged polymeric chains, which is highly electrically neutral and bridging to colloids and particles in water, and strongly removes trace toxic and heavy metal ions. It has stable properties. Polyaluminium chloride is produced due to the bridging action of hydroxyl ions and the polymerization of multivalent anions. Aluminum chloride is an inorganic polymeric water treatment agent with large relative molecular mass and high charge.

The acid residue in polyaluminum chloride (PAC, polymerized aluminum, polyaluminum chloride) (AL) (aluminum trichloride) products is very weak, and the hydrogen ion concentration index of its aqueous solution is basically close to neutral, so there is no corrosion (explanation: refers to decay, disappearance, erosion, etc.) With the development of pipeline conveying materials, the flow of corrosive liquids can fully meet the requirements of use. Therefore, the use of polyaluminium chloride will not cause corrosion to pipelines and equipment. Please rest assured. Polyaluminium chloride is a highly charged polymer ring chain with Keggin structure, which has a high electric neutralization and bridging effect on colloids and particles in water, and can remove trace toxic substances and heavy metal ions with stable performance. Due to the bridging effect of hydroxyl ions and the aggregation of multivalent anions, the prepared polyaluminium chloride is an inorganic polymeric water treatment agent with high relative molecular mass and high charge.

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Does polyaluminium chloride corrode pipes and equipment

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