Passivation, Dross and Weld Discoloration Removal

Many metals protect themselves from corrosion by forming a passivation layer on their outer surface.  This protective layer is composed of metal oxide or metal nitride and is very thin.  For stainless steels, the layer may be only 1-3 angstroms thick and for metals such as aluminum and titanium, the layer may be up to 50 angstroms thick. (A human hair is 500,000 angstroms thick for comparison).  Passivation can occur naturally with exposure to oxygen or can be assisted by various passivation techniques such as electrolytic anodization, plasma treatment or chemical treatment.  Due to the limited thickness of the passivation layer, the substrate being passivated must be very clean to begin with to prevent discontinuities in the passivation layer which would then compromise the protective nature of the passivation layer.

Machining, cutting, welding, polishing or otherwise “working” a metal substrate generally introduces contaminants which prevent the formation of a uniform passivation layer.  Even particulate in the shop air can contaminate the metal surface and prevent uniform passivation.  Magnus Engineered Equipment can supply the proper equipment to clean and passivate the metal substrates.

Laser or plasma cutting stainless steel or other metals can produce a dross which needs to be removed for part functionality and proper passivation.  The same is true for stainless steel or other metal discoloration that occurs from welding.  Often, aggressive etchants such as hydrofluoric acid and nitric acid are used to remove dross and less aggressive chemistry can be used to remove discoloration.  The use of ultrasonics is useful for removing dross and discoloration and the 20 kHz ultrasonics offered by Magnus Engineered Equipment is the most powerful ultrasonics in the cleaning industry.

Contact Magnus Engineered Equipment to see how we can assist with your metal passivation, dross and discoloration removal needs.

Sand, Core and Shell Investment Casting Removal

Sand, Core and Shell Investment Casting Removal Using Caustic Leaching

Magnus Engineered Equipment (MEE) has supplied equipment to the investment casting industry for more than 50 years. Investment casting, or die casting, is a technique for forming metallic components having complex geometries, especially hollow components. Hollow cored super alloy airfoils and gas turbine engine components are examples of complex geometries produced with the investment casting process. MEE equipment is used with concentrated caustic solutions of NaOH (sodium hydroxide) or KOH (potassium hydroxide) to remove shell residues from ferrous and non-ferrous metal castings (including aluminum). Operating at just below the boiling point of the solution, the process breaks down the fused silica shell used in the investment casting process without damaging the metallic substrate. The process is faster, safer and more efficient than mechanical methods of shell removal and all surfaces within the substrate are cleaned.

MEE supplies equipment which uses heat, agitation and turbulation to quickly and effectively remove the shell residues from substrates including the complex geometries found in many castings. The effect of agitation and turbulation increases the dissolution rate by increasing chemical mass transfer at the shell interface. Agitation and turbulation act to quickly remove dissolved silica and spent chemistry from the substrate surface while bringing in fresh chemistry to continue the dissolution reaction at the fastest rate. MEE supplied equipment also continuously filters the bath thus removing dissolved silica and enhancing the dissolution rate of the remaining ceramic shell by returning clean chemistry to the part surface.


The temperature at which the caustic solution is operated is dictated by the concentration of the NaOH or KOH used. As a rule of thumb, it is advisable to operate at a temperature which is 20 oF below the boiling point of the solution being used so as to prevent cavitation in the pumps used to circulate the solution. (The lower pressure on the suction side of the pump lowers the boiling point of the solution). Most users of MEE equipment operate with a NaOH or KOH solution concentration of 35 to 50 wt%.


MEE supplies off-the-shelf or custom designed equipment for investment casting removal applications. Material handling, by-product removal, automation and post-processing needs can be addressed by MEE to make the overall process efficient and worry-free. Contact MEE today to discuss your investment casting application.


Willoughby, Ohio – Magnus Engineered Equipment LLC (MEE), a leading manufacturer of industrial cleaning equipment, announced the successful implementation and launch of the Epicor Cloud ERP solution on April 25th.  The goal was to replace an outdated legacy system with a fully integrated state-of-the-art, modern enterprise resource planning system. The new system allows MEE to improve its production planning capability and provide better customer service.

All of the company’s historical data was preserved and accessible by our customer service team through a secured database.  This data includes customer order detail, supplier purchasing history, and detailed parts master descriptions. The company continues to maintain a serial number database for equipment manufactured dating back to the 1930’s.

The new ERP application will enhance the customer experience by:

  • Providing customers accurate capable to promise delivery dates
  • Allow the capability to seamlessly integrate with the company’s new online store
  • Future mobile and customer-facing applications to improve customer interface

Jeffrey MendralaChief Financial Officer, MEE, said “This success was only possible by having the right team in place to deliver and set up MEE for success. The new Epicor solution will provide the platform to allow MEE to execute on its strategic plan for the long term.

Magnus Engineered Equipment

We are pleased and excited to announce that Magnus Engineered Equipment LLC has agreed to acquire the Magnus Equipment Company.

Our plans are big; we will take what has been accomplished over the past 95 years and grow a company that embraces continuous improvement. Our products are found in various industries that produce mechanical components such as aerospace, automotive, remanufacturing, energy, castings, medical technology, and electronics.

Some of our plans have already been set in motion. We are in the process of designing a new facility that located in Northeastern Ohio. This facility is being designed with innovation and efficient production processes in mind. We will continue to design, test, and manufacture all of our products under one roof. ISO certification is planned for the fourth quarter of 2016. We have begun to contact our key suppliers to form strategic partnerships that will improve our product capability while also reducing cost. To improve our capability to promise accurate delivery dates, we are in the process of implementing the latest version of EPICOR’s ERP solution.

This is just a start. We are adding additional engineering and design expertise giving us the most talented technical team in our industry. We are also expanding our ability to analyze and develop the cleaning chemistry needed to meet our customers’ cleanliness requirements. Once we have relocated we will be investing in new manufacturing equipment that will improve our capability and quality.

With innovative standard solutions and individually customized cleaning systems, Magnus Engineered Equipment will meet all of our customers’ requirements.

We can’t wait to start working with the team at Magnus to build a company that embraces the newest technology to continuously improve our products and services for all of our customers.

William Martin – President/CEO
Jeffrey S. Mendrala, CPA, CVA – Chief Financial Officer

Precision Machining Technology Show | April 21st – 23rd

Presented by the Precision Machined Products Association, PMTS is the only show in North America dedicated to the Precision Machining industry.

We were so happy to show you some of our innovative products as well as samples of material handling applications!  We had such a great time we wanted to share some of our fun with you all!!

We look forward to seeing you all again in 2017!

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Products Finishing – Publication

Article from:  Products Finishing, Tim Pennington – Editor

PCx Show Promises New, Efficient Ways to Clean Parts

As the industry continues to move forward, Chris Schiele of Magnus Equipment said he sees the future in the parts cleaning market as a ‘one stop shop’ concept.

“By automating conveyors and reducing equipment footprints, we are able to handle cleaning, material handling, and finishing all in one place, using less space,” says Schiele. “As technology continues to advance, we see the one-stop shop becoming a more prevalent concept with parts cleaning.”