Blog – Allegheny Surface Technology

Mechanical Polishing vs Electropolishing

What is Mechanical Polishing? Mechanical polishing is the mechanical smoothing and removal of contaminants. It involves grinding, polishing and buffing of the surface. This process is used to smooth welds, prepare metal for surface treatments like electropolishing or provide a surface with a specified roughness. What is Electropolishing? Electropolishing is an electrochemical process that smooths….. Read More »

Why is Passivation Necessary?

Manufacturing stainless steel parts begins with fabrication or machining. All parts must be made to particular specifications and follow the guidelines of design and application. Once fabrication or machining is complete, parts are likely to have with free iron and other foreign material embedded in the surface. Why it matters: As the final step, passivation….. Read More »

The Difference Between Pickling and Passivation of Stainless Steel

Pickling and passivation are different types of chemical metal finishing that provide corrosion protection on metal surfaces. Both processes remove excess (or exogenous) iron or oxidation from the surface of whatever metal undergoes the process. Pickling (removing an oxide layer) and passivation (applying an oxide layer) are different finishing processes. Why it matters: In order….. Read More »

The Difference is in the Documentation

The statement, “no job is complete without the proper documentation” holds true for many industries, as well as the organization overseeing them. The higher the operational standards, the more critical it is to document that procedures have been performed to meet or exceed those standards. Most bio-pharma, food and beverage, cosmetics, and medical device manufacturers….. Read More »

Rouging and its Consequences

Let’s talk about “rouge” (French for ‘red’) and I don’t mean the cosmetic term… Rouging is a symptom of corrosion that occurs on stainless steel due to iron contamination.  Often unpredictable and imperfectly understood, the rouge is composed of corrosion products that include hydrogen and iron oxides in different states of oxidation. Specific colors (or….. Read More »

The Critical Steps To Achieving Compliance With ASTM Standards

At Allegheny Surface Technology we meet standards set by the following to better satisfy the needs and expectations of our customers. Electropolishing Specifications: ASTM B912 – Standard Specifications for Passivation of Stainless Steel Using Electropolishing ASME BPE – Bioprocessing Equipment Passivation Specifications: ASTM A967 – Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts….. Read More »

5 Key Business Benefits Of Stainless Steel Pickling

Stainless steel pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, rust or scale from stainless steel. It is commonly used to remove oxide layers from welding and heat-treating.  A solution containing strong acids, is used to remove the surface impurities. Metal pickling or chemical descaling is but one….. Read More »

5 Key Business Benefits Of Stainless Steel Passivation

Stainless steel passivation is the chemical process that removes free iron from the surface of stainless steel for the purpose of enhancing corrosion resistance. Allegheny Surface Technology (AST) offers either citric or nitric acid passivation based on your specific requirements. Metal passivation is but one of several pretreatment steps available for preparing an article for….. Read More »

Critical Services Performed On-Site At Two Large Biotechnology Companies

Recently Allegheny Surface Technology performed critical services On-Site at two large Biotechnology companies. The services and benefits are as follows: » AST performed de-rouging and passivation on exterior surfaces of the customer supplied stainless steel equipment. The work was performed on a variety of parts including tanks, mezzanines, skids systems, countertops, benches, etc.  These services….. Read More »

Which is Better for Which Application? Mechanical Polishing or Electropolishing

Mechanical polishing is the mechanical smoothing and removal of contaminants. It involves grinding, polishing and buffing of the surface. This process is used to smooth out welds, prepare metal surfaces for electropolishing or provide a surface with a specified roughness.  Allegheny Surface Technology (AST) employs experienced and highly skilled craftsmen who have the training and….. Read More »

Corrosion Resistance and Chemical Passivation

Passivation of stainless steel is the chemical process that removes free iron from its surface for the purpose of enhancing corrosion resistance. Allegheny Surface Technology (AST) offers either citric or nitric acid passivation based on your specific requirements. Steel Passivation creates a chromium rich surface which can form an invisible inert (passive) oxide layer as….. Read More »

Focusing On the Future of Pharma at ISPE

ISPE stands for International Society for Pharmaceutical Engineering. It’s the world’s largest not-for-profit association serving its Members by leading scientific, technical and regulatory advancement throughout the entire pharmaceutical lifecycle. All scientific and technical areas of the pharmaceutical manufacturing industry are represented among the ISPE Membership. Engineers, microbiologists, chemists, QA/QC, production, process development, pharmacists, regulatory and….. Read More »