What is Robotic Solder Dip (Retinning, Alloy Conversion, Alloy Refresh)?

The integrity of every electronic component matters in high-reliability industries. That’s why processes such as robotic solder dip – also known as retinning, alloy conversion, or alloy refresh play a vital role in protecting supply chains and extending component life.

What is Robotic Solder Dip?

Robotic solder dip is a controlled process that removes old or compromised tin finishes from component leads and replaces them with fresh solder.

Depending on alloy composition, it helps eliminate defects such as tin whiskers and ensures components meet the required alloy specification for their end-use environment.

The process is especially important in defence, aerospace, avionics, and space applications, where failure is not an option.

When do you need this service?

This technique is applied in several scenarios:

  • Alloy conversion – where components need to be converted from lead-free to tin/lead finishes, or vice versa, to match system requirements.
  • Alloy refresh – where parts have been stored for extended periods and the finish has oxidised or become unsuitable for assembly.
  • Retinning – to repair or restore solderability on aged or contaminated leads.
  • Counterfeit mitigation – providing assurance that the leads are refreshed and genuine before deployment.

In every case, the goal is the same: improved solderability, extended component lifespan, and reduced risk of in-field failures.

How is Robotic Solder Dip Done?

The process combines robotics, precision control, and strict standards. At Retronix, it typically follows these steps:

  • Component Preparation – Devices are carefully checked and, if required, masked to protect sensitive areas from solder exposure.
  • Robotic Handling – Components are loaded into a robotic system, ensuring consistent positioning and movement.
  • Flux Application – A precise amount of flux is applied to promote wetting and improve solder adhesion.
  • Controlled Immersion – The robotic arm dips the leads into a solder bath at tightly controlled angles, depths, and dwell times.
  • Alloy Replacement (if required) – The old finish is stripped away and replaced with the required solder alloy (such as tin/lead or lead-free).
  • Cooling and Cleaning – Parts are then cleaned to remove any flux residues.
  • Inspection and Testing – Every batch is checked for solderability, finish quality, and compliance with standards such as GEIA-STD-0006.

This repeatable and traceable process ensures every component meets the highest level of reliability and performance.

Why does automation matter?

Traditional manual solder dip methods are widely used across the industry and, when performed by skilled technicians, can achieve good results. Many companies rely on manual dipping for certain applications, and it remains an accepted practice.

However, manual methods naturally introduce more variability. Temperature, dwell time, and immersion angles can be harder to control by hand, which may affect repeatability in critical applications.

That’s why Retronix has invested in state-of-the-art robotic systems. Automation ensures:

  • Consistent process control across every component.
  • Repeatability and precision, vital for aerospace and defence standards.
  • Compliance with international standards including GEIA-STD-0006.
  • Traceability – with full process records for customer confidence.

Our robotic solder dip solutions are designed with both precision and flexibility in mind. Whether you need a full alloy conversion programme for thousands of components, or a refresh for a critical batch of spares, our systems deliver the highest levels of reliability.

By combining advanced robotics with decades of expertise, we help customers reduce risk, ensure compliance, and extend the usable life of their electronic components. That’s why leading organisations across aerospace, defence, and other high-reliability industries choose Retronix.

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