ADVERTISEMENT
2 /3 FREE ARTICLES LEFT THIS MONTH Remaining
Chemistry matters. Join us to get the news you need.

If you have an ACS member number, please enter it here so we can link this account to your membership. (optional)

ACS values your privacy. By submitting your information, you are gaining access to C&EN and subscribing to our weekly newsletter. We use the information you provide to make your reading experience better, and we will never sell your data to third party members.

ENJOY UNLIMITED ACCES TO C&EN

Environment

Chemistry in Pictures: Losing pressure

March 16, 2018

Credit: Bob Pearce

This micrograph shows a leak caused by corrosion on the inside of a tin-plated aerosol can. Bob Pearce, R&D director for NCH Corp., wanted to test the shelf life of a coil cleaner for air conditioners. He and a colleague loaded the cleaner, which is a water-based solution containing sodium hydroxide, into a pressurized can and heated it continuously for 90 days in an oven to accelerate the breakdown of the can. After 30 days, the container’s pressure began to drop, indicating a leak, and it began to deteriorate visibly. At the trial’s end, the researchers inspected the can with a microscope and found that a breach in the coating had allowed the sodium hydroxide in the cleaner to seep underneath and corrode the can’s wall.

The largest hole is less than .5 mm.

Submitted by Bob Pearce


Do science. Take pictures. Win money. Enter our photo contest here.

For more Chemistry in Pictures, visit our new home on cen.acs.org.


Related C&EN Content:

Tin pest.

X

Article:

This article has been sent to the following recipient:

Leave A Comment

*Required to comment