In hot summer beach and coastal scenes, tinplate sunscreen spray is an essential product for outdoor sun protection. The tinplate sunscreen spray can that holds this product is constantly exposed to three types of erosion: seawater salt spray, human sweat, and strong ultraviolet rays. Tank body rust and seam peeling have become common problems in the industry. Many sunscreen brands have received after-sales complaints due to substandard tank rust prevention after mass marketing. As a professional manufacturer focusing on custom tinplate aerosol cans, SAILON has developed a special external rust prevention enhancement process for such outdoor scenarios, fundamentally solving the corrosion problem of tinplate sunscreen spray cans in salt spray environments.

Those who have worked in the packaging supporting of daily chemical sunscreen products all know that the corrosion logic of beach environments is far more complex than ordinary scenes. Sodium chloride in seawater, electrolytes in sweat, coupled with long-term ultraviolet radiation, will quickly age the coating of ordinary tinplate aerosol cans. Weak parts such as the tank bottom and welds will show red rust and blistering in just a few weeks. This not only affects the product appearance but also reduces the brand’s credibility in the market. SAILON’s enhanced process is deeply optimized around these practical application pain points, and each process is tailored to the mass production and long-term use of tinplate cans for sunscreen spray.

Core Process of Tank Body Rust Prevention Enhancement: Three Layers of Progressive Protection

SAILON’s external rust prevention process developed for tinplate aerosol cans for beach sunscreen spray abandons the traditional single coating method and adopts a three-layer progressive protection design. Each layer is specially adjusted according to the erosion characteristics of salt spray and ultraviolet rays, and the process details are fully suitable for large-scale customized production:

1. Zinc-rich epoxy primer base: Adopt epoxy modified primer with high-purity zinc powder ratio, evenly adhere to the tinplate substrate through electrostatic spraying process, and form a dense cathode protection layer after high-temperature curing. Even if there are tiny scratches on the substrate, zinc powder will preferentially oxidize to avoid direct corrosion of the tank body.
2. UV-resistant iron printing and varnish coating: Use UV-resistant polyester ink in the iron printing link, matched with special UV-resistant photosensitive varnish. After secondary high-temperature curing, the film hardness and weather resistance are greatly improved, and no embrittlement, cracking or fading will occur due to long-term exposure.
3. Precise secondary repair coating of welds: Aiming at the weak points of rust prevention treatment for tinplate aerosol can welds, automatic repair coating equipment is used to carry out full-coverage spraying on the weld area, fill the damaged coating during welding, and block the core channel of electrochemical corrosion.

Tank Structure Optimization: Reducing Corrosion Hidden Dangers from the Design Source

In addition to the coating process, the detailed design of the tank structure is also the key to improving the salt spray resistance of tinplate sunscreen spray cans. Many manufacturers only focus on the coating but ignore the water and salt accumulation caused by the structure. In the mold design stage, SAILON has carried out special optimization on the key parts of the tank body:

• The edge of the tank bottom adopts a large arc R-angle design of R3.5mm, replacing the traditional right angle or small arc structure. Seawater and sweat can slide off quickly after contact, and no water corrosion points will form at the tank bottom.
• The tank body curling edge is thickened and sealed to reduce gaps for salt spray penetration and improve the overall airtightness and protection of the tank.
• The tank body corners are designed with arc transition to avoid coating damage caused by sharp corner bumps and further reduce the risk of corrosion.

Authoritative Performance Test Comparison

In accordance with the latest national standards and international general test standards, we conducted a comparative test on tinplate sunscreen spray cans with conventional technology and SAILON enhanced technology. All data come from third-party professional testing institutions, truly reflecting the protection ability of the tank in salt spray, UV and sweat environments:

Customized Adaptation Solutions

According to the rust prevention customization of tinplate sunscreen spray cans needs of different brands, SAILON also provides flexible customized adjustments, which can match the formula characteristics of different sunscreen products and brand visual needs:

• The coating thickness can be adjusted according to customer requirements to adapt to the rust prevention level needs of different usage scenarios.
• Support exclusive iron printing design, UV-resistant ink can restore brand colors, and will not fade after long-term outdoor placement.
• The weld repair coating process can be adjusted according to tank specifications, adapting to tinplate sunscreen spray aerosol cans of different capacities.
• All coatings meet the environmental protection standards of daily chemical product packaging, no harmful substances remain, and are suitable for food-grade and daily chemical-grade packaging requirements.

Frequently Asked Questions

1. Are tinplate sunscreen spray cans with enhanced rust prevention process suitable for large-scale customized production?

Absolutely suitable. All rust prevention processes of SAILON are adapted to automated production lines, which can meet the production needs of large-scale orders, while ensuring the process consistency of each batch of tanks, and no quality differences will occur due to mass production.

2. Can complete inspection reports be provided for customized tinplate sunscreen spray cans for salt spray environments?

We can provide a full set of inspection reports such as third-party salt spray test, UV aging test, and adhesion test with the goods, meeting customers’ quality verification and market access requirements.

3. Will the rust prevention coating affect the printing effect of the tank body and the spray use experience?

No, our varnish and primer are transparent and light-weight materials, which will not cover the printing pattern. At the same time, the inside of the tank body adopts a special food-grade coating, which does not contact the sunscreen product and does not affect the normal use and discharge effect of the spray at all.

4. Can the rust prevention process parameters be adjusted for sunscreen spray cans of special specifications?

Of course. SAILON supports adjusting coating ratio, repair coating range, structural design and other parameters on demand, creating exclusive custom tinplate aerosol cans solutions for customers, adapting to sunscreen spray tanks of various non-standard specifications.

For sunscreen product brands, the quality of packaging is directly related to the product’s market reputation. Especially for tinplate sunscreen spray frequently used outdoors, the rust prevention ability of the tank body is a core detail that cannot be ignored. With years of can-making process accumulation, SAILON integrates salt spray protection, UV aging resistance and structural optimization to create tinplate cans for sunscreen spray that can not only cope with harsh environments such as beaches and coasts, but also meet the multiple needs of brands for quality, customization and large-scale supply. If you need to customize professional rust-proof tinplate sunscreen spray cans, please contact SAILON, we will provide one-stop supporting services from design and sample making to mass production.