PCS Coating Failure Analysis and Remediation 2

Question 1

Which type of coating failure is characterized by fine, shallow cracks that do not penetrate through the entire coating film thickness?

Accepted Answer

Checking

Answer

Checking refers to fine, shallow cracks confined to the upper layers of the coating film that do not penetrate through to the substrate.

Question 2

Rust staining on a coating surface in the absence of visible coating failure most likely indicates which underlying condition?

Accepted Answer

Mill scale or embedded iron remaining on the substrate

Answer

Residual mill scale or iron particles embedded in the surface during improper preparation will corrode under or through the coating, causing rust staining without obvious delamination.

Question 3

When investigating a coating failure, what must be the first step before any remediation work begins?

Accepted Answer

Document and photograph the failure in detail

Answer

Thorough documentation and photography before any remediation preserves evidence needed to diagnose the root cause and prevent recurrence.

Question 4

Cathodic disbondment of a protective coating is most commonly associated with which system?

Accepted Answer

Cathodic protection systems

Answer

Cathodic protection systems generate hydroxyl ions at cathodic sites beneath the coating, raising pH and breaking down adhesion, causing cathodic disbondment.

Question 5

When a coating failure extends through the entire coating system down to bare substrate, which remediation approach is required?

Accepted Answer

Complete removal to bare substrate and full recoating

Answer

When failure extends to the substrate, complete removal to bare metal and full system recoating is required to ensure a sound, adherent new system.

PCS - Protective Coatings Specialist Certification Practice Test

PCS - Protective Coatings Specialist Certification Practice Test

PCS Coating Failure Analysis and Remediation 2