Highly wear-resistant, sun-resistant decorative oxide film

Conversion coating category: High‑wear‑resistant, sunlight‑resistant decorative oxide film Application area: Self‑lubricating black oxide coating for automotive sunroof slide rails Partner: All automotive friction components have this type of requirement Advantages of the conversion coating: Currently, we are in discussions with Changchun Hengtuo Group to supply a self‑lubricating black oxide coating for sunroof slide rails to the German‑owned Webasto company, which holds a 65% global market share in sunroofs. Samples are undergoing nine performance tests. Our oxide‑coating process is well‑established, and we are confident of securing this project; within the year, we plan to build a dedicated production line in Changchun with an annual capacity of 800,000 sets. Should SAIC have similar requirements, we would welcome the opportunity to collaborate.

High wear resistance, low surface roughness oxide film

Conversion coating type: high‑wear‑resistant, low‑roughness oxide film Application areas: valve bodies made of high‑silicon aluminum alloys Partners: automotive component manufacturers producing transmission housings, air‑conditioning pumps, brake pumps, and more Conversion coating advantages: Currently in production are ADC12 brake pump housings, automatic transmission valve bodies, and A390 swash plates for air‑conditioning pumps, all manufactured on a dedicated automated high‑silicon aluminum oxidation line. The challenge with this type of oxide coating lies in its stringent performance requirements, which exceed the capabilities of standard aluminum anodizing processes.

High-gloss, acid- and alkali-resistant, oxidation-resistant film

Conversion coating type: High-gloss, acid- and alkali-resistant anodized film Application areas: Roof rack bars, door trim strips Partners: Demand exists for four Kia models as well as comparable B‑segment vehicles Advantages of the conversion coating: In 2016, processed rack samples and a small batch of 300 units passed GM’s ten‑point performance tests, and all on-site process‑technology and production preparations were completed. However, the project was subsequently halted when DEEZEE, a U.S. company, canceled its investment plans in China.

Decorative oxide film

Conversion coating type: Decorative oxide film Application areas: Radiator covers, business-class cabin table panels Partners: China Railway Corporation‑affiliated enterprises including Zhuzhou, Qingdao Sifang, and Changchun Railway Vehicles Co., Ltd. Advantages of the conversion coating: Interior components such as high-speed train windows, radiator covers, and table panels all require an E6 (matte silver satin) decorative finish; this coating is widely used in numerous aluminum alloy decorative products.

Heavy-duty anti-corrosion oxide film

Conversion coating type: Heavy-duty anti-corrosion oxide film Application areas: SGT rotary seat legs and cover plates Partners: China Railway Corporation, Zhuzhou, Qingdao Sifang, and Changchun Railway Vehicles Co., Ltd. Advantages of the conversion coating: All externally sourced high-speed train carriage components are subject to stringent requirements for resistance to corrosion in marine humid environments; moreover, Bombardier and SGT orders also impose these same requirements.

Self-lubricating hard oxide film

Conversion coating type: Self-lubricating hard oxide coating Application areas: High-speed railway automatic door tracks, aluminum alloy profiles for luggage racks Partners: CRRC-affiliated enterprises including Zhuzhou, Qingdao Sifang, and Changchun Railway Vehicles Co., Ltd. Advantages of the conversion coating: This self-lubricating oxide coating maintains a low coefficient of friction over long periods without the use of lubricants, operates silently, and requires no maintenance. It is suitable for all types of automatic door tracks, such as those in operating rooms and libraries, where a quiet, automated environment is essential.

Native hard anodic oxide film

Conversion coating type: Natural‑color hard anodized coating Application area: High-speed rail entrance steps Partner companies: CRRC subsidiaries in Zhuzhou, Qingdao Sifang, and Changchun Railway Vehicles Advantages of the conversion coating: While aluminum alloy hard anodized coatings typically come in various colors, high-speed rail car designs mandate a uniform silver‑white finish for the aluminum exterior (except for door rails). Through advanced technical processes, our company has successfully achieved exceptionally high hardness and superior wear resistance in 6-series aluminum alloys at specified hardness levels.

Alodine coating

Conversion coating type: Alodine coating Application area: Primer for military‑grade coatings Partners: AVIC, Shandong AVIC, Hui, and other enterprises Advantages of the conversion coating: Both the natural‑color and yellow‑tinted coatings have been incorporated into MIL‑C‑5541E, the U.S. military standard for “Chemical Oxidation of Aluminum and Aluminum Alloys,” and are now widely adopted in domestic military specifications. Due to hexavalent chromium contamination, few manufacturers outside the southern military‑industrial complex currently employ this process, making it a relatively rare and specialized technology.