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Dryer drum rusted?

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I've learned something new today!

General corrosion

This type of corrosion takes place with minimum interference from the external factors. It will automatically happen when the pH of the stainless steel metal falls below 1.

Intergranular attack

The granules of the stainless steel can be under attack by different elements such as heat. The high temperature of over 450 degrees Celcius can cause the disintegration of the carbon particles. In doing so, it will make the surface of the steel to be exposed to different elements.

Bimetallic corrosion

Bimetallic corrosion happens when two different metals with a common electrolyte come into direct contact with each other. This corrosion is sometimes referred to as galvanic corrosion.

There will be a redox reaction, which simply means a reduction and oxidation chemical reactions. The results will be cells that create electric potential on the surface of the metal.

Stress corrosion

The external stress that is exerted on stainless steel can cause some form of corrosion. This will in turn expose the steel to different elements of rust.

Contamination during manufacturing and cleaning, welding

Small particulates, plain steel become embedded within the surface and cause surface staining on the stainless steel.

If the part is machined on a CNC machine that also does steel parts, small particulates of steel can end up contaminating the coolants. The stainless steel part that is machined will become permanently embedded within the surface.

Similarly, buffing wheels that are used on steel parts than on stainless can similarly embed steel particulates. This applies to other steel tools, such as wrenches.

It’s these foreign non-stainless particles that are undergoing the rusting and causing the surface of the steel to stain. Inspect your machining storage area, and make sure that they’re not cross-contaminating your stainless parts.

How Do You Keep Stainless Steel From Rusting

Whether it is for small applications such as home appliances or for industrial applications, you should strive to protect your stainless steel from rust. But how can you do so?

There are various simple but effective ways of guarding stainless steel against rust. Here are some of these tips;

Clean using non-abrasive tools: When it comes to cleaning the stainless steel parts, ensure that you use soft items such as cloth. They will not corrode the surface of the metal, exposing it to rust.

Use non-chloride cleaners: This can be alkaline or alkaline chlorinated cleaners as they will not corrode the steel. Avoid cleaners that contain quaternary salts

Always use treated water when cleaning stainless steel

You should never use hydrochloric acid on steel

Clean the stainless steel products materials frequently to get rid of stubborn stains.