Stainless Steel Corrosion Resistance

Question 1

What happens if 2 pieces of stainless steel are bolted tightly together and left outdoors in the weather?

Answer 1

Corrosion will develop between the 2 pieces while the outer surface will remain clean. This effect is called “Crevice corrosion” or “anaerobic (without oxygen) corrosion”

Question 2

What happens if 2 pieces of stainless steel are bolted tightly together and left outdoors in the weather?

Answer 2

Corrosion will develop between the 2 pieces while the outer surface will remain clean. This effect is called “Crevice corrosion” or “anaerobic (without oxygen) corrosion”

Question 3

Welding carbon steel to stainless steel

Answer 3

Use a high nickel content filler metal (E309, E312) otherwise the fusion zone of the weld bead could become extremely hard and brite, resulting in cracking and failure during service

Question 4

What treatments help to increase corrosion resistance?

Answer 4

Acid cleaning (pickling) and then passivating which puts a thin layer of chromium oxide on metal that protect it from corrosion

Question 5

What chromium particles can be produced when welding and grinding operations?

Answer 5

Hexavalent chromium also called “chromium six”. The threshold limit value (TLV) is set at 5 micrograms or less per cubic metre of air in an 8 hr working day