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    « An interesting note regarding stainless steel... | Main | Use Electropolishing to Expose manufacturing errors and inconsistancies »
    Wednesday
    May132009

    Use passivation/pickling to expose sub-standard metal compositions and manufacturing errors

    An over looked benefit to passivating and pickling is the ability for it to expose sub-standard metal compositions and errors in manufacturing

    • Case study #1: A marine supply company brought 304 stainless steel caribiners for passivation and electropolishing to increase corrosion resistance and aesthetic appeal in a marine environment. We also use these parts to secure and hang other parts in our passivation tank. Upon post treatment inspection it was observed that over 50% of each part had been dissolved/etched away within the standard treatment time. Upon further inquiries and testing it was discovered that the parts were from a new  lower priced overseas manufacturer and the composition of the "questionable" 304 stainless steel was sub-standard. Upon further testing the parts failed under less load than comparable pieces from other manufacturers. After informing the customer this new manufacturer was dropped and future potential part failures were avoided.

     

    • Case Study #2: 80 gallon 304 stainless steel heat exchange tank was passivated inside and out to remove weld scale and increase overall corrosion resistance, life, and peformance. Upon post treatment inspection it was observed that the internal 90 degree elbows welded to the exchange coil had dissoved between 20-90%. Upon further enquiries it was discovered that the metal composition was sub-standard. After informing the customer, future supplies of elbows are now gauranteed by the supplier and pre-mature part failing is avoided. 

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