Ford FLTM BI 123-03 Component Corrosion Test

The “Ford FLTM BI 123-03 Component Corrosion Test” standard, developed by Ford Motor Company (Ford), describes a test procedure used to evaluate the corrosion performance of coatings applied to components. This standard is designed to simulate the corrosive conditions of the Arizona test site vehicle accelerated corrosion test (CETP 00.00-R-311). The tests require an automated cyclic corrosion test chamber with forced air circulation, a temperature control of 65 degrees plus/minus 2 degrees, and a relative humidity control of 90 percent plus/minus 2 percent.

In the high-risk automotive manufacturing world, where vehicles must withstand harsh environmental conditions ranging from salty winter roads to coastal humidity, corrosion remains one of the most persistent threats to longevity and safety. Leading the industry, Ford Motor Company has developed the Ford FLTM BI 123-03 standard under its Body Interior (BI) standards to ensure the durability of its components, establishing it as a critical protocol for evaluating the corrosion resistance of assembled automotive parts. This standard incorporates a standard salt spray test specifically designed for components such as fasteners, brackets, and underbody assemblies. As vehicles become more sophisticated with advanced materials and coatings, understanding and applying this standard becomes even more crucial.

The Ford FLTM BI 123-03 standard is part of Ford’s comprehensive series governing laboratory simulations of real-world degradation. Unlike broader standards such as the ASTM B117 standard, which applies to flat panels, this standard focuses on the practical challenges of three-dimensional components. It simulates accelerated corrosion exposure to predict how parts will perform over years of service life.

This method is particularly important, for example, as it is included in Ford's WSS-M9P9-B standard for dynamic sealing and WSS-M2P177-B1/B2 standards for chassis paint durability. This integration ensures that corrosion testing is consistent with Ford's holistic approach to vehicle design and emphasizes prevention rather than remediation.

The Ford FLTM BI 123-03 standard essentially aims to assess the integrity of corrosion-resistant treatments on automotive components in aggressive, salt-laden environments. It targets not only painted sheet metal parts but also fully assembled elements subjected to cyclic stress, such as door hinges, exhaust connections, or fuel line connections. By simulating conditions such as road salt de-icing or a marine atmosphere, the test helps identify weaknesses in coatings, such as zinc-nickel alloys or trivalent passivators, before they lead to failures in the field.

This standard is narrow in scope but effective: it excludes flat panel assessments and focuses on measurable metrics such as base metal loss, blistering, and crevice corrosion. This specificity makes it indispensable for suppliers in Ford’s global supply chain, where non-compliance could halt production lines.

Implementing the Ford FLTM BI 123-03 standard requires sensitivity and adherence to specific equipment and safety protocols, such as in salt spray chambers. The general steps of the procedure, derived from Ford's guidelines and industry practices, are as follows:

• Sample preparation: Components must represent manufacturing parts, including electroplated liners or sealants. Panels or assemblies are cleaned according to the Ford FLTM BI 120-01 standard to ensure proper starting conditions. Scratches or edges are added to simulate manufacturing defects.
• Exposure setup: Samples are placed in a corrosion chamber at an angle of 15-30 degrees to ensure even mist distribution. The environment mimics a neutral salt spray: 5% sodium chloride solution at 35 degrees and a mist collection rate of 1-2 mL/hour per 80 cm².
• Cycles and duration: Unlike continuous exposure, this standard incorporates cycles (typically 240–500 hours of salt spray and moisture drying) to mimic real-world wet-dry fluctuations. This Arizona test site simulation accelerates natural corrosion by 10–20 times.
• Post-exposure assessment: After testing, parts undergo visual inspection, adhesive tape tests, and mass loss measurements. Ford's acceptance criteria do not require more than 5% red rust coating and minimum streak shift (less than 3 mm).

The Ford FLTM BI 123-03 standard does not exist in isolation. It is closely linked to its predecessor, the Ford FLTM BI 123-02 (coated fastener corrosion test), which focused on geared hardware, and its panel-based analog, the Ford FLTM BI 123-01 (painted sheet metal corrosion test). Together, these three standards form a trio of corrosion testing standards.

Suppliers who fail this test risk rejection, as seen in past recalls related to underbody corrosion.

There are some obstacles to implementing the Ford FLTM BI 123-03 standard: reservoir variability, edge effects in complex geometries, and subjective interpretation of visualizations can distort results. Innovations such as automated imaging and AI-powered corrosion mapping address these issues, allowing laboratories to integrate them for faster turnaround times. In the future, as autonomous and connected vehicles become more widespread, this standard may evolve to include electrical corrosion on sensor-loaded exterior surfaces.

In short, the Ford FLTM BI 123-03 standard ensures the corrosion protection of metal by simulating harsh conditions in a controlled laboratory. For engineers, suppliers, or enthusiasts, complying with this standard is about building confidence on the road.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its customers, providing the advanced testing services they require, and assisting in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services to businesses in accordance with the "Ford FLTM BI 123-03 Component corrosion test" standard.