ASTM Analysis Procedures: How to perform analyses according to ASTM B117

In the surface finishing industry, especially for metalworking companies and those requiring anodizing processes, ensuring the quality and durability of applied coatings is fundamental. To achieve this, various international standards are used to standardize testing and analysis methods, guaranteeing reliable and comparable results. Among these standards, ASTM B117 stands out as a benchmark for evaluating corrosion resistance through salt spray testing. But how are these ASTM analysis procedures carried out correctly and efficiently? The process is explained in detail below, with examples and practical recommendations for implementation.

ASTM analytical procedures: essential steps for the salt spray test

ASTM B117 establishes an accelerated method for evaluating the corrosion resistance of materials and coatings through controlled exposure to a salt spray in a special chamber. This procedure is widely used to simulate harsh environmental conditions and predict product performance in the field.

To perform this test, it is essential to follow a series of steps that ensure the reproducibility and validity of the results:

1. Sample preparation : The parts or coatings must be clean, dry, and free of contaminants. In some cases, pretreatment is recommended to remove oils or residues that may interfere with the test.

   
   

2. Salt spray chamber setup : The internal temperature should be set, usually to 35°C, and the saline solution prepared with a standard 5% sodium chloride concentration. The solution is atomized to create a fine mist that coats the samples.

   
   

3. Sample placement : The pieces are placed at an angle, preventing the liquid from accumulating on horizontal surfaces, which could alter the results. It is important that they are securely held and spaced apart to allow for uniform mist circulation.

   
   

4. Test duration : Depending on the type of material and the client's requirements, the exposure time can vary from 24 hours to several days or weeks. During this time, environmental conditions are monitored and periodic observations are recorded.

   
   

5. Evaluation of results : At the end of the test, the samples are inspected to identify signs of corrosion, oxide formation, blistering, or coating detachment. Complementary techniques such as microscopy or chemical analysis may be used for a more precise diagnosis.

   
   

This procedure, although simple in appearance, requires rigorous control and careful interpretation for the results to be useful in technical and commercial decision-making.

Vista frontal de cámara de niebla salina con muestras metálicas en exposición

Importance of ASTM analysis procedures in the surface finishing industry

Why is it so important to follow these ASTM analysis procedures? The answer lies in the need to ensure that products meet international standards for quality and performance, especially when they are intended for demanding markets or critical applications.

For example, a metalworking company that manufactures components for the automotive industry must ensure that its parts resist corrosion caused by exposure to saline environments, such as those found in coastal areas or during winter with the use of de-icing salts. The ASTM B117 standard allows for the simulation of these conditions in the laboratory, accelerating the evaluation process and preventing costly failures in the field.

Furthermore, for companies that use anodizing, this test is essential to validate the coating's integrity and its ability to protect the metal substrate. Defective anodizing can lead to premature corrosion, affecting the product's appearance and functionality.

In short, correctly implementing ASTM analysis procedures not only improves the quality of the final product, but also strengthens customer confidence and competitiveness in the global market.

What is ASTM B117?

ASTM B117, officially titled "Standard Practice for Operating Salt Spray (Fog) Apparatus", is a standardized method developed by ASTM International to evaluate the corrosion resistance of materials and coatings by exposure to a controlled salt spray.

This standard defines the operating conditions for the salt spray chamber, including the concentration of the salt solution, the temperature, the duration of the test, and the method for preparing and placing the samples. Its main objective is to provide a reproducible and accelerated method for simulating corrosion that occurs in aggressive natural environments.

It is important to note that, although the salt spray test is very useful for comparing the relative resistance of different coatings or treatments, it does not always accurately reflect the behavior under real conditions, so it should be complemented with other evaluations and analyses.

Plano detalle de solución salina siendo atomizada en cámara de prueba

Practical recommendations for optimizing analysis according to ASTM B117 standard

To maximize the usefulness and accuracy of the results obtained in the salt spray test, it is recommended to follow some good practices that facilitate interpretation and avoid common errors:

• Keep the saline solution fresh and well prepared : The concentration must be precise, and the solution must be renewed regularly to avoid contamination or changes in composition.

  
  

• Strictly control temperature and humidity : Variations can affect fog formation and corrosion rate, altering the results.

  
  

• Record conditions and observations in detail : Keeping a record of each test, including times, environmental conditions and any anomalies detected, helps to compare results and detect trends.

  
  

• Conduct pilot tests before the final evaluation : This allows you to adjust parameters and ensure that the procedure is adapted to the specific characteristics of the material or coating.

  
  

• Train the staff in charge : A team well trained in camera operation and results interpretation reduces the possibility of errors and improves the quality of the analysis.

  
  

Implementing these recommendations helps make ASTM B117 analysis a reliable and valuable tool for continuous improvement in the surface finishing industry.

Applications and benefits of ASTM B117 analysis in the metalworking and anodizing industries

The use of ASTM B117 goes beyond simply evaluating corrosion resistance; it becomes a strategic element for various industrial applications. For example:

• Validation of new coatings : Before launching a product on the market, it is essential to check its behavior against corrosion to guarantee its durability.

  
  

• Quality control in production : Performing periodic tests allows detecting deviations in the coating or anodizing process, ensuring product consistency.

  
  

• Research and development : Facilitates comparison between different formulations or treatments, accelerating innovation and improvement of materials.

  
  

• Regulatory compliance and certifications : Many international standards require corrosion testing to certify products, and ASTM B117 is a commonly accepted reference.

  
  

The benefits of applying this standard include reduced costs from premature failures, improved customer satisfaction, and a strengthened reputation for the company as a reliable and technologically advanced supplier.

Keys to integrating ASTM B117 analysis into business growth strategy

For companies seeking to consolidate their position and grow in the competitive global market, integrating ASTM B117 analysis into their production and control processes is a strategic decision. Some key elements for achieving this are:

• Investing in the right technology : Having modern, calibrated salt spray chambers ensures accurate and reproducible results.

  
  

• Form alliances with experts and specialized suppliers : Collaborating with entities that provide technical knowledge and support facilitates implementation and continuous improvement.

  
  

• Incorporating analysis into the organizational culture : Promoting the importance of quality and innovation among all levels of the company ensures a collective commitment.

  
  

• Use the results for decision-making : Analyze the data obtained to optimize processes, select materials, and design more resistant products.

  
  

• Communicating the benefits to customers and partners : Showing commitment to quality and durability strengthens trust and opens new business opportunities.

  
  

In short, the ASTM B117 analysis is not just a technical test, but a key tool for boosting competitiveness and sustainable growth in the surface finishing industry.

Understanding and correctly applying ASTM analysis procedures, especially ASTM B117, is fundamental to ensuring the quality and durability of metallic coatings. This technical knowledge, combined with innovation and a commitment to excellence, allows companies to stand out in an increasingly demanding and globalized market. Therefore, having the support of experts and advanced technology is an essential step toward achieving success and international competitiveness.

To delve deeper into the topic and access specialized resources, you can consult the following link on analysis according to ASTM B117 .