Cross Section Analysis

Mounting Procedure

Metallographic preparation requires encapsulating the extracted specimen in thermosetting or cold-curing resin to preserve the delicate interface between the coating and the base material. Precision wet grinding with silicon carbide papers followed by diamond polishing suspensions removes deformation artifacts created during abrasive wheel sectioning. Poor edge retention during grinding rounds the interface boundaries, corrupting microscopic measurements.

Etching with specific chemical reagents reveals grain boundaries, intermetallic distribution and thermal diffusion zones beneath the outer plating.

Layer Verification

Microscopic measurement under calibrated optical systems or scanning electron microscopes yields definitive thickness data across irregular topographies. Through cross section analysis, technicians identify internal voids, delamination seams and brittle intermetallic phases that remain invisible to surface eddy-current or magnetic gauges. Porosity density and micro-crack networks penetrating to the substrate metal are cataloged against contractual acceptance thresholds.

Uniformity ratios between exterior planar sections and recessed interior corners quantify the throwing power of the plating process.

Adhesion Evaluation

Structural adherence between disparate metallic phases reveals its mechanical soundness under transverse shear induced during mounting. When mechanical preparation tears the deposit away from the substrate, cross section analysis documents whether failure occurred cohesively within the coating or adhesively at the boundary line. Market supervision authorities review these cross-sectional failure surfaces when evaluating conformity with mandatory industrial machinery standards.

Such empirical evidence settles commercial breach-of-warranty claims arising from premature coating spallation in heavy machinery operating environments.