TinShield Plus-III

1. Introduction

TinShield Plus-III is a solvent-free, water-based protective agent for tin and tin alloys that is specifically designed for high-speed continuous plating. The protective layer formed on the tin surface significantly enhances its oxidation resistance and wear resistance.

2. Properties

● Simple Operation – The workpiece is immersed in the working solution, where a chemical reaction forms an effective protective film.

● Solvent-Free & Eco-Friendly – The process contains no organic solvents, and the protective layer is non-toxic and non-irritating, improving safety and environmental compliance.

● Heat Resistance – Short-term heat treatment (below 300°C) has minimal impact on the protective layer’s performance.

● Preserves Electrical & Soldering Properties – The protective layer hardly affects the contact resistance or solderability of the tin coating.

● Water Stain Resistance – Provides protection against water marks.

● Long Bath Life – Extended usability of the plating solution.

● Enhanced Oxidation & Wear Resistance – Superior protection against oxidation and abrasion.

3. Composition

Heat the concentrate to approximately 50°C and shake well. Then dilute the concentrate in hot deionized water, and it is ready for use.

4. Operating Parameters

Important Notes:

● Do not introduce alkaline substances into the working bath.

● Before use, heat the product to 70°C, soak for 1 hour, and stir well for uniform mixing.

5. Process Flow

1. Tin (or tin alloy) plating

2. Rinse (3 times)

3. Immerse in protective agent

4. Hot water rinse (40–50°C; 2 times)

5. Rinse (25–40°C)

6. Spin dry

7. Oven dry (120°C)

Important Note:

● Do not use electrolytic protection afterward, as it will significantly reduce the effectiveness of this protective agent.

6. Solution Replenishment

If the working solution cools down or remains idle for an extended period, it may separate into layers. Heating will restore its normal condition.

Regularly replenish evaporation losses with deionized water.

To achieve optimal protection, maintain TinShield Plus-III at 100% working concentration, which can be controlled through analytical methods.

7. Solution Preparation

Important: Before using TinShield Plus-III, shake the container thoroughly to ensure uniform mixing of the product.

1. Thoroughly clean the working tank.

2. Fill with 75% of the total volume using deionized water, then heat to operating temperature.

3. While stirring, slowly add TinShield Plus III and mix well.

4. Top up with deionized water to the final working volume, then stir until homogeneous.

5. Adjust the solution to working temperature

6. It is now ready for use.

8. Equipment

● Tank Material: PP (Polypropylene) or Plastic

● Ventilation: Required

● Heating: PTFE (Teflon)-coated or similar

Note:

The working tank must be equipped with an overflow system, circulation pump, and heating system.

When production is stopped, the tank should be covered for protection, and the circulation pump should remain running.

9. Troubleshooting

10. Analytic Testing

Method Principle

The protective agent components are digested and react with ammonium molybdate to form phosphomolybdenum blue, with absorbance measured at 880 nm.

Reagents & Equipment

Reagents:

● Concentrated sulfuric acid (H₂SO₄)

● 30% Hydrogen peroxide (H₂O₂)

● Ammonium molybdate solution (5%)

● Ascorbic acid solution (1%)

Instruments:

● Spectrophotometer

● Digestion system (hot plate or microwave digester)

Standard:

● TinShield Plus-III concentrate (as reference)

Procedure

1. Sample Digestion:

● Take 1 mL sample, add 10 mL concentrated H₂SO₄ and 5 mL H₂O₂.

● Heat until clear (~200°C), then cool and dilute to 50 mL.

2. Color Development:

● Take 5 mL digested solution, neutralize pH.

● Add 2 mL ammonium molybdate and 1 mL ascorbic acid, then heat in boiling water bath for 10 min.

3. Absorbance Measurement:

● Measure absorbance at 880 nm and calculate concentration via standard curve.

4. Standard Curve:

● Prepare TinShield Plus-III standard solutions following the same steps to plot the curve.

Precautions

● Perform digestion in a fume hood to avoid acid vapor exposure.

● Avoid introducing external phosphorus sources—if present, additional correction is required.

11. Disclaimer

All recommendations and suggestions regarding our company's products in this manual are based on experiments and data we deem reliable. Since we cannot control the actual operations of other practitioners, our company cannot guarantee or be held responsible for any adverse consequences.