Testing Scratch Resistance Beyond the Surface
New tests do more than scratch the surface of automotive coatings.
Know that sickening feeling when you exit the grocery store and find your car has been banged up by a runaway shopping cart? One day, these memories may represent just a bad memory if auto body manufacturers make use of a new suite of tests developed by the National Institute of Standards and Technology (NIST) and three industry partners. Data from these tests could eventually help vehicle exteriors better defend themselves against dings, dents, scratches and things that go bump on the highway.
In a new paper in the journal Progress in Organic Coatings,1 researchers at four organizations—NIST and industry partners Eastman Chemical Co., the Hyundai America Technical Center and Anton Paar USA—describe three versions of a fast, reliable laboratory method for simulating scratching processes on automobile clearcoats (the uppermost, or surface, layer of an exterior polymer composite coating). The tests are designed to give manufacturers a better understanding of the mechanisms behind those processes so that future coating materials can be made more scratch resistant and resilient.
Stronger is Better
Stronger, more robust coatings are important to meet both consumer and industrial demands. For example, statistics show that: people are keeping their cars longer and want them to stay attractive (those owning cars for more than two years rose 41% from 2006 to 2015); nearly 600,000 drivers work for ride-sharing services in the U.S. that require them to maintain vehicle appearance; improved paint durability is consistently among the top-three performance requirements for original equipment manufacturers; and 60% of all consumer complaints about autos are attributed to paint scratches and chip imperfections.
Currently, automobile coating manufacturers use two simple test methods to evaluate clearcoat scratch resistance and predict field performance: the crockmeter and the Amtech-Kistler car wash. The former is a device that uses a robotic “finger” moving back and forth with varying degrees of force to mimic damage from human contact and abrasive surfaces, while the latter is a rotating wheel of brushes that simulates the impact of car washes on clearcoats.
“Unfortunately, both methods only assess clearcoat performance based on appearance, a qualitative measure where the results vary from test to test, and they don’t provide the quantitative data that scientifically helps us understand what happens to auto finishes in real life,” said NIST physicist Li Piin Sung, one of the paper’s authors. “We demonstrated a test method that characterizes scratch mechanisms at the molecular level because that’s where the chemistry and physics happen … and where coatings can be engineered to be more resilient.”
Testing on a Nano Level
For their test method, the researchers first tapped a diamond-tipped stylus across the surface of a polymer composite sample to map its morphology. Next, they used the stylus to create a scratch, and then retapped and remapped the surface. Three different scales of scratch tests—nano, micro and macro—were conducted using different sized tips and different ranges of force.
The quantitative differences between the pre-scratch and post-scratch profiles, along with microscopic analyses of the scratches, provided valuable data on vulnerability to deformation (How deep does the scratch go?), fracture resistance (How much force does it take to crack the composite?) and resilience (How much does the material recover from the physical insult?).
NIST ran the nano-scratch test with a tip radius of 1 micrometer (a micrometer is a millionth of a meter, or about one-fifth the diameter of a strand of spider silk) and a force range between 0 and 30 micronewtons (a micronewton is a millionth of a newton, or about 20 millionths of a pound of force). Anton Parr did the micro-scratch test with a 50-micrometer tip and a force range between 25 micronewtons and 5 newtons (equivalent to 5 millionths of a pound to 1.25 pounds of force), while Eastman Chemical performed the macro-scratch test with a 200-micrometer tip and a force range between 0.5 and 30 newtons (equivalent to one-tenth of a pound to 7.5 lbs of force).
When scratches in the clearcoat are a few micrometers in depth and width, and occur without fracture, they are referred to as mars. According to Sung, these shallow, difficult-to-see deformations are most often the result of car washing. She explained that the nano-scratch test performed at NIST provided the best data on the mechanisms of marring and light scratches, while the micro- and macro-scratch tests conducted by NIST’s partners were better at yielding detailed information about the larger, deeper and more visible deformations known as fracture scratches—the injuries caused by keys, tree branches, shopping carts, and other solid objects.
“Data from the nano-scratch test also proved best for determining how well the coating responded to physical insult based on its crosslink density, the measure of how tightly the polymer components are bound together,” Sung said. “With this molecular-level understanding, clearcoat formulas can be improved so that they yield materials dense enough to be scratch resistant and resilient, but not so hard that they cannot be worked with easily.”
The researchers concluded that to get the truest evaluation of clearcoat performance, the nano-, micro- and macro-scratch tests should be conducted in conjunction with the current industry standard methods. “That way, one gets the complete picture of an auto body coating, both qualitatively and quantitatively characterized, so that the tougher coatings created in the lab will work just as well on the road,” Sung said.
For more information, visit www.nist.gov. Eastman Chemical Co. can be found online at www.eastman.com; the Hyundai America Technical Center at www.hatci.com; and Anton Paar USA at www.anton-paar.com/us-en.
- L. Feng, N. BenHamida, C-Y. Lu, L.P. Sung, P. Morel, A.T. Detwiler, J.M. Skelly, L.T. Baker and D. Bhattacharya, “Fundamentals and Characterizations of Scratch Resistance on Automotive Clearcoats,” Progress in Organic Coatings, December 2018.