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Will polyaluminum chloride corrode pipes and equipment?

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Industry News

2022-06-06

Does the use of polyaluminum chloride (also known as PAC, polyaluminum chloride, or polyaluminum chlorides—aluminum trichloride) cause corrosion of pipes and equipment (note: referring to corrosion, degradation, or erosion)? As is well known, polyaluminum chloride is synthesized from hydrochloric acid (HCl) and bauxite (note: several components are combined to form a single entity); hydrochloric acid is highly corrosive.

Does the use of polyaluminum chloride (also known as PAC, polyaluminum chloride, or polyaluminum chlorides—aluminum trichloride) cause corrosion of pipes and equipment (note: referring to corrosion, degradation, or erosion)? As is well known, polyaluminum chloride is synthesized from hydrochloric acid (HCl) and bauxite (note: several components are combined into a single entity); hydrochloric acid is highly corrosive. Given this, is polyaluminum chloride itself also highly corrosive and capable of causing corrosive damage to water pipelines and other equipment?

Now let’s take a closer look at these situations:

1. As for the product itself, hydrochloric acid used in the manufacturing process is primarily employed to neutralize aluminum dross during the reaction, yielding polyaluminum chloride (aluminum trichloride), also known as PAC, polyaluminum, or polyaluminum chloride. Although this product does have a certain level of acidity, its acidity is already quite weak—this is precisely why we say it’s not suitable for consumption and should not come into contact with the eyes. However, its acidity is far from strong enough to corrode (i.e., rot, dissolve, or erode) pipes and equipment.

2. As for water pipelines, current pipeline manufacturing processes incorporate certain corrosion-resistant materials, primarily to ensure the pipelines’ stability—meaning they remain stable and unchanged—under conditions involving specific chemical liquids and high-sulfur environments. Polyaluminum chloride is a new type of water purification material—a inorganic polymeric flocculant, commonly referred to as polyaluminum or PAC. It is an aqueous soluble inorganic polymer that lies between AlCl3 and Al(OH)3. Its general chemical formula is [Al2(OH)nCl6-n·mL], where m represents the degree of polymerization and n denotes the neutrality level of the PAC product. Polyaluminum chloride features highly charged polymeric chains with a Keggin structure, which exert strong electrostatic neutralization and bridging effects on colloids and particulates in water. It also demonstrates remarkable efficacy in removing trace toxic substances and heavy metal ions. Moreover, it exhibits remarkably stable properties. The production of polyaluminum chloride is facilitated by the bridging action of hydroxyl ions and the polycondensation effect of multivalent anions. Aluminum chloride is an inorganic polymeric water treatment agent with a relatively high molecular weight and high charge.

The residual acidity in polyaluminum chloride (PAC, polyaluminum, polyaluminum chloride) products (AL) (aluminum trichloride) is extremely low; the hydrogen ion concentration of its aqueous solution is essentially close to neutral. Consequently, there is no corrosion—defined here as decay, disappearance, or erosion—associated with its use. As pipeline technologies for material transport continue to advance, the flow rates of corrosive liquids can fully meet operational requirements. Therefore, using polyaluminum chloride will not cause corrosion to pipelines or equipment. Please rest assured. Polyaluminum chloride is a highly charged polymeric ring chain with a Keggin structure, exhibiting strong electrostatic neutralization and bridging effects on colloids and particulates in water. It can effectively remove trace amounts of toxic substances and heavy metal ions, and boasts stable performance. Thanks to the bridging effect of hydroxyl ions and the polymerization action of multivalent anions, the polyaluminum chloride produced is an inorganic polymeric water treatment agent with a relatively high molecular weight and high charge density.

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