Harbin Sanyong Metal Surface Technology Co., Ltd.

The company’s research platform, Harbin Sanyong HIT Technology Co., Ltd., was established in 2010. It has maintained long-term, in-depth collaboration with Professor Li Ning’s research group at Harbin Institute of Technology, forming a dedicated joint research consortium focused on developing environmentally friendly metal surface‑treatment additives and innovative process technologies. In terms of core technologies, the company concentrates on two key areas: functional oxide films for aluminum alloys and functional surface treatments for military‑grade applications (conversion coatings and platings). To date, it has introduced more than 80 mature process technologies to domestic surface‑treatment enterprises, covering surface‑treatment processes for aluminum, magnesium, and titanium alloys, as well as specialized military‑grade electroplating and various metal conversion‑coating additives. As an organization that has been engaged in the R&D and industrial-scale deployment of functional oxide films for aluminum alloys for 13 consecutive years, the company has successfully brought over ten such technological innovations into practical application, providing critical technical support for national key research projects. Its military‑related offerings are particularly noteworthy, featuring several industry‑leading processes, including a low‑stress zinc–nickel plating technology that replaces traditional cadmium plating, a passivation process for conductive surface films on 2xxx‑series aluminum alloys with salt‑spray resistance exceeding 300 hours, and an aluminum alloy micro‑arc oxidation insulation process capable of withstanding voltages above 1,400 V. In 2025, the company successfully secured funding for two national “Smart Eye” projects, earning national recognition for the innovative strength of its research team.

The company has established a standardized R&D center, laboratory, testing facility, and pilot‑scale production base, boasting a comprehensive research system and highly efficient R&D processes. It is capable of meeting over 90% of the industry’s requirements for light‑alloy conversion‑coating processes, while also offering end‑to‑end, high‑end, customized metal surface‑treatment solutions.

The company operates 13 specialized surface‑treatment production lines, encompassing intelligent, fully automatic, semi‑automatic, and manual processes. The process portfolio balances the complementary nature of conversion‑coating technologies with comprehensive coverage of military‑grade standards, currently supporting 62 distinct processing methods. Supporting these lines, the mechanical pretreatment and heat‑treatment sections are continuously upgrading their equipment to state‑of‑the‑art levels: in the mechanical pretreatment section, more than half of the dozen standard units are automated, enabling large‑scale, precision manufacturing for a wide range of processes and product specifications; the heat‑treatment section is equipped with four intelligent air‑dehydrogenation furnaces and two intelligent vacuum dehydrogenation furnaces.

The production process encompasses the following: the production line covers five major categories of anodizing for military‑grade applications, three types of hard anodizing for aluminum alloys, two micro‑arc oxidation lines for light alloys, and two functional anodizing lines for aluminum alloys. It also includes a dedicated line for various chemical conversion coatings on light alloys, specialized plating lines for Zn–Ni, cadmium, and tin, separate lines for precious‑metal plating and electroless plating, stainless‑steel passivation, and bluing of specialty steels—covering the full spectrum of processes, each with its own distinctive features and complementary strengths.

Our service scope is comprehensive, enabling one-stop completion of a full range of processes, including anodizing, hard anodizing, micro-arc oxidation, chemical conversion coatings, functional coating layers for military‑industrial and scientific research applications, specialized plating, bluing of high‑alloy steels, precision finishing of stainless steels, custom localized treatments, and patterned surface‑customization services. We can meet over 90% of the surface‑treatment requirements for components in the military‑industrial and aerospace sectors.

In the field of coating and film‑layer testing, the company has equipped its existing testing center in accordance with CNAS standards, installing high‑precision instruments such as X‑ray fluorescence spectrometers, Fischer eddy‑current thickness gauges, microhardness testers, salt‑spray chambers, surface roughness meters, and cleanliness analyzers. This comprehensive setup ensures precise control over coating and film‑layer quality, guaranteeing both accuracy and reliable test results from raw materials to finished products.

With 32 years of deep industry expertise, the company has consistently adhered to a people‑centric development philosophy and adopted a management model in which business leaders take the lead. Its three tiers of managerial personnel and technical core staff all boast 5 to 30 years of industry experience, bringing rich hands‑on expertise and a solid professional foundation. The company has established robust systems for ongoing professional training and quality control, rigorously enforcing a stringent three‑stage inspection process—self‑inspection, peer‑review, and specialized inspection—and implementing tiered performance evaluations. As a result, every employee demonstrates world‑class quality awareness, practical operational skills, and adherence to industry‑leading quality‑control standards, ensuring a strong talent base that underpins its commitment to delivering high‑quality processing services.