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Actually, I also just found the solution (well, sort of). I went into the svjour3 cls file and found where the equations in two column mode are default set "fleqn" (line 42 of the code I believe). Just delete the "fleqn" inside the curly brackets , {}, and you'll get centered equations. Again, this ...

I'm having the same problem and came upon this thread. My minimum working example is as follows:

\documentclass[twocolumn]{svjour3}
\usepackage{amsmath}

\makeatletter
\AtBeginDocument{\@ifpackageloaded{amsmath}{\@mathmargin\z@}{}}%
\makeatother

\begin{document}
\begin{equation}
6x=2
\end ...