Chinese cars with galvanized bodies: myths, technologies and real resources

The question of the corrosion resistance of cars from the Middle Kingdom remained the most painful for potential buyers for many years. Stereotypes that Chinese cars begin to “bloom” immediately after leaving the showroom, still exist in the minds of many car enthusiasts, although the reality has changed dramatically over the past decade. Modern Chinese factories have introduced advanced hot-dip galvanizing lines, which are not inferior in technical level to, and sometimes even exceed, European standards.

Today, the Russian market is dominated by models whose bodies undergo multi-stage processing, including phosphating, cataphoresis priming and the application of several layers of enamel. However, not all manufacturers use full galvanization all panels, often limited to treating only the most vulnerable areas or the bottom. Understanding the difference between “partial” and “full” protection is critical when choosing a vehicle that plans to operate in harsh winter conditions with reagents.

In this material we will analyze in detail the anti-corrosion protection technologies used by leading brands such as Geely, Chery, Haval and Exeed. You will find out which models have double-sided hot-dip galvanized panels, and where only the cold method or partial processing is used. This knowledge will help you avoid buying a car that will require expensive body repairs in three or four years.

Anti-corrosion technologies: hot versus cold

To understand the quality of the body, it is necessary to understand the physical and chemical processes that occur during the application of the zinc layer. The most reliable method is considered hot galvanizing, in which steel sheets are immersed in molten zinc at a temperature of about 450 degrees Celsius. As a result, an alloy of iron and zinc is formed, which provides electrochemical protection: even with a deep scratch, the zinc itself begins to rust, “sacrificing” itself to preserve the steel.

A less expensive, but also less effective way is cold galvanizing. In this case, zinc-containing paint is applied to the metal by galvanic method or spraying. Such protection works more like a barrier, isolating the metal from oxygen and moisture, but if the integrity of the coating is compromised, corrosion can quickly spread under the paint layer. Many budget Chinese brands have been using this method for a long time.

⚠️ Attention: The presence of zinc in the soil does not guarantee complete protection. If the manufacturer claims “zinc-containing coating,” check the application method. The cold method requires the paintwork to be in perfect condition, otherwise corrosion is inevitable.

Modern premium lines of Chinese automakers, such as Exeed and flagship models Geely, switched to using high-strength steels with factory hot-dip galvanization. This allows us to provide a guarantee against through corrosion for a period of up to 10-12 years, which is direct proof of the quality of the technologies used. It is also important to distinguish between single-sided and double-sided galvanizing: for external body panels, processing on both sides is critical.

The process of producing a body in modern factories also includes phosphating, which improves the adhesion of the primer, and the application of a cataphoresis layer by immersing the entire welded body in a bath of primer under the influence of current. It is this stage, called KTL process, provides protection to internal cavities that cannot be reached with a spray gun. Without a high-quality “gurney”, even a galvanized sheet can rot from the inside.

Geely and Chery: leaders in body metal quality

Company Geely became one of the first Chinese brands to rely on metal quality, collaborating with Volvo. The technologies of the Swedish concern were introduced at Geely factories, which made it possible to establish the production of cars with fully galvanized bodies. Models Geely Coolray, Geely Tugella and updated Geely Atlas They are assembled on lines where almost all external panels are galvanized.

Geely engineers use double-sided hot-dip galvanized steel for the doors, hood, trunk lid and fenders. Thresholds and pillars also undergo enhanced processing. This is confirmed by long-term tests in salt fogs, which the cars withstand without the appearance of rust. For Russian conditions, this means that in the absence of mechanical damage to the body, the owner does not have to worry about corrosion for at least 5-7 years.

Holding Chery also significantly raised quality standards. New models such as Chery Tiggo 7 Pro and Chery Tiggo 8 Pro, are manufactured using technologies obtained through cooperation with international partners. Chery factories have introduced automated welding and painting lines, where the thickness of the paintwork and the presence of the zinc layer are controlled by robots.

Chery pays special attention to the protection of welds and hidden cavities. The technology of applying sealants and anti-corrosives to hard-to-reach places is used at the stage of body assembly. This prevents moisture from accumulating inside the side members and struts, which is often the cause of hidden corrosion in older vehicles.

It is worth noting that even leaders have exceptions in their budget lines. Therefore, when purchasing an entry-level model, e.g. Chery Bonus 3 (in older versions), you should be more careful: there could be partial galvanization of only the bottom and arches, while the roof and doors were treated only with soil.

Haval, Exeed and premium segment: luxury level protection

Brand Haval, owned by the Great Wall concern, was initially positioned as a more premium brand, and the quality of the bodies here corresponds to the declared status. The plant in the Tula region, where many models for the Russian market are assembled, uses the same standards as the parent plant in China. Models Haval F7/F7x and new Haval Dargo have bodies with a high percentage of galvanized parts.

Haval technologists use the hot-dip galvanizing method for the elements most susceptible to corrosion: arches, sills, doors and the lower part of the trunk lid. The hood and roof can be cold galvanized or high-quality primed, since there is less risk of chipping and contact with reagents, but the overall durability of the body is rated very highly by experts.

Sub-brand Exeed from Chery represents the pinnacle of the holding's engineering. These vehicles feature advanced security techniques including dip galvanizing individual parts before welding. This ensures that even the inner surfaces of the panels are protected. Models Exeed TXL and Exeed VX demonstrate excellent resistance to aggressive environments.

⚠️ Attention: When purchasing Exeed or Haval, pay attention to the build quality of the gaps. Even the best zinc will not save you if water and dirt constantly flow into the joints of the panels. The tightness of the body is the key to longevity.

Premium "Chinese" cars are often equipped with additional protection options, such as reinforced mudguards and plastic door sills that physically protect the paintwork from sandblasting. However, you should not rely on them alone: ​​moisture can accumulate under the covers, so it is recommended to remove the decorative elements for inspection once a year.

The table below provides a comparison of body protection methods among popular brands:

Budget segment: where the risks lie

When it comes to budget Chinese cars, the situation becomes ambiguous. Entry level models such as some versions Changan or old modifications Lifan and Brilliance, often saved on anticorrosive to reduce the price. In these cars, only the bottom and arches could be galvanized, and the rest of the body was covered with a regular phosphate layer.

Particularly vulnerable areas in the budget segment are the edges of doors, welds under seals and areas around moldings. There, the zinc layer is often missing or damaged during assembly. Owners of such cars are recommended to carry out additional anti-corrosion treatment of hidden cavities immediately after purchase.

In addition, cheap models may use lower quality metal, which is more susceptible to corrosion even with a protective layer. The thin layer of zinc is quickly consumed in Russian winter conditions, and the rusting process begins earlier than competitors with thicker coatings.

However, even in the budget class there is progress. New models replacing old ones already receive improved protection. For example, updated versions Changan CS35 Plus demonstrate much better durability than their predecessors from five years ago.

How to check the quality of body protection yourself

The buyer of a used or new car does not need to be a chemist to assess the condition of the body. There are a number of visual signs that will help determine the quality of anti-corrosion protection. First of all, pay attention to the edges of the doors and trunk lids: they should be evenly painted, without blistering or chipping the paint down to the metal.

Use a paint thickness gauge. Although it will not directly indicate the presence of zinc, a coat of paint or primer that is too thin may indicate cost savings by the manufacturer. The normal thickness of paintwork on Chinese cars varies in the range 90-130 microns. Values ​​below 70 µm should be cause for concern.

Be sure to look under the car. The bottom must be covered with a uniform layer of a protective composition or have plastic protection. Rust on suspension components or the exhaust system (which is normal for uncoated steel) should not transfer to body parts.

It is also worth paying attention to the build quality of the gaps. If the gaps between the panels “walk” or have different widths, this may indicate a low production standard, which indirectly affects the quality of the anti-corrosion treatment of welds.

Operation and care: extending the life of the body

Even the highest quality galvanized body requires proper care. Zinc protects the metal electrochemically, but this resource is not endless. Aggressive reagents that are used to sprinkle roads in winter can destroy the protective layer faster than the salt of sea air. Therefore, regular car washing in winter is not a matter of aesthetics, but a necessity.

It is recommended to wash the car using shampoos that neutralize reagents at least once every 10-14 days in winter. Pay special attention to the wheel arches and underbody. Using a pressure washer helps remove salt from hidden cavities and under fender liners.

⚠️ Attention: Never delay repairing chips on a galvanized body! Although zinc is protective, an open wound in the metal is an entry point for moisture. Mask the chip with a special pencil paint as soon as you notice it.

Additional anti-corrosion treatment (anti-corrosion) for modern Chinese cars with full galvanization is often a waste of money, unless you plan to drive off-road or store the car in very aggressive conditions. Factory protection for modern Geely, Chery and Haval models is enough for the entire period of ownership.

In summer, you should also not forget about your car. Dirt mixed with bird sweat and tree sap can damage the varnish and reach the metal. Regular washing and periodic polishing will help maintain the factory shine and protective properties of the coating.

Frequently asked questions (FAQ)